Atlas›Domain XI · Traditional medicine & indigenous healing›Guide 016
Guide XI-016

Sri Lankan tovil

Sri Lanka
A 38 · L 51 · M 1114 interventions in the Trinity explorer
Client cardCompare
[source: …] where a claim comes from[uncertain] not confirmed in a primary source[synthesis] the writer's reconstruction

1. Introduction

Version followed: tovil as described by Sri Lankan community press and Sinhala practitioners' schools (low-country, "Pahatharata" tradition), by Bruce Kapferer's ethnography of Sinhala Buddhist exorcism in the Galle region (1983, as summarised in a published review), and by Sri Lankan clinical and medical-anthropology literature; the therapist's own work follows the DSM-5-TR Cultural Formulation Interview (APA). This is a ceremonial healing tradition, not a psychotherapy: the guide is written for a psychotherapist working alongside it, never performing it.

What it is. Tovil (also spelt thovil) are Sinhala healing rituals addressed to yakku (demons, malign spirits; singular yakā, also yaksha), performed by hereditary ritual specialists. Sri Lankan press describes the healers as "Yak Gurunnanses" (demon specialists), trained by long apprenticeship within the family, the craft passing from grandfathers to fathers to sons; the low-country tradition is also presented publicly as "Shaanthi Karma" (blessing ceremonies) and taught as dance and drumming by schools in Ambalangoda. [source: Sunday Observer, "Masks and drum beats live on"] Other names for practitioners in the literature include adura/ädura (Wolffers 1988) and kattadiya (Galappaththi, Psychiatry in pictures); yakdessa is used for the officiants of the related Kohomba Kankariya ritual (Ranasinha). [source: Wolffers 1988; Galappaththi; Ranasinha] Usage of these titles varies by region and community [uncertain: not verified].

What it addresses, as the tradition and its observers describe it. Mainly mental and psychological disturbance and illnesses of unknown cause, understood as an upset of a person's normal equilibrium caused by yakku. [source: Sunday Observer] Galappaththi describes the rituals as used to relieve forms of mental distress "believed to be caused by demonic spirits", particularly in rural communities. [source: Galappaththi] Within Sinhala Buddhist cosmology demons sit in a hierarchy below deities and the Buddha; origin narratives describe demons of illness as having been tamed by the Buddha. [source: Ranasinha; Sasaki review of Kapferer 1983]

How change is understood (attributed, not asserted). In Kapferer's account (an outsider's ethnography based on repeated observation of the Mahasona exorcism among Buddhist Sinhala working-class and farming communities near Galle), illness is not only an individual's affliction: it disrupts the order of the family, kin group and local society, and the cosmic order linking demons, humans and deities; cure restores and reconstructs that order around the patient. [source: Sasaki review of Kapferer 1983] Community press frames the communal performance as acting on the person's psychological state and on the whole social group. [source: Sunday Observer] Clinical observers describe a pluralistic system in which families move between ritual healers, Ayurvedic physicians, Buddhist clergy and Western medicine. [source: Amarasingham 1980; Wolffers 1988]

The psychotherapist's core idea of change. Accurate understanding of the client's and family's explanatory model, cultural identity and help-seeking (CFI) allows a shared formulation that neither pathologises a culturally meaningful affliction nor misses a treatable disorder, and allows collaboration with the client's chosen healers when the client wishes. [source: APA CFI; synthesis]

2. Framework

The tradition's own structure belongs to its practitioners and is not described here. The framework below is the psychotherapist's work. [synthesis, built on APA CFI materials]

Phase A: Engagement and cultural assessment (sessions 1–2).

  • Goals: understand the problem in the client's terms; learn whether a tovil, another ritual healer, Buddhist clergy or other help has been consulted or is planned; screen for risk and medical urgency.
  • Format: core CFI (16 questions) at first evaluation; informant version with a family member if the client agrees. [source: APA CFI; APA Informant Version]
  • Move on when: a provisional cultural formulation exists, risk is assessed, and the client knows you will not judge or forbid their other help.

Phase B: Differential formulation (sessions 2–4, longer if unclear).

  • Goals: distinguish culturally normative experience (e.g. a spirit-affliction idiom, trance within a sanctioned ritual) from disorder (psychosis, mood disorder, dissociative disorder, trauma, organic illness) using DSM-5-TR and ICD-11 criteria and cultural consultation.
  • Format: CFI supplementary modules (Explanatory Model; Spirituality, Religion and Moral Traditions; Coping and Help-Seeking; Social Network; Cultural Identity; Immigrants and Refugees where relevant), which may be given at first evaluation, later, or repeatedly. [source: APA Supplementary Modules]
  • Move on when: you can state, with the client, what each help source is for and what would signal medical urgency.

Phase C: Parallel care and collaboration (ongoing).

  • Goals: agreed treatment plan that sits alongside the client's chosen religious or ritual help; liaison with healers, clergy or the family only with consent; prescriber involvement where indicated.
  • Format: usual weekly or fortnightly therapy; family sessions as useful. Session counts are not set by any source [synthesis].
  • Move on when: symptoms and functioning improve, or a safety concern requires escalation.

Phase D: Integration and relapse planning.

  • Goals: help the client make sense of any ritual experience in their own terms, consolidate gains, and plan who they will turn to if distress returns.
  • End when: the client has a plan that names both community and clinical routes.

Escalation at any phase: suicidality, violence, signs of physical illness or delirium, restraint or harm during a ritual, or a minor at risk triggers safeguarding and medical steps (Section 4, Safeguarding). [synthesis; source: Dias and Gooneratne 2011]

3. Guiding principles

  • Write and act alongside, not inside, the tradition. You assess and treat; ritual healing belongs to its hereditary specialists and the communities who sanction them. Practical meaning: never offer, imitate or advise on ritual steps. [source: Sunday Observer on family lineages; synthesis]
  • Attribute, do not adjudicate. Describe yakku and demonic affliction as the client and tradition hold them, neither confirming nor dismissing. Practical meaning: use phrases such as "in your family's understanding". [synthesis]
  • Expect medical pluralism. Sinhala families commonly use several systems in sequence or at once; one patient's movement among healers kept any single explanation from dominating. Practical meaning: ask about all help sources, every time, as normal practice. [source: Amarasingham 1980; Wolffers 1988]
  • Healer contact is common and is not by itself delay. In one Colombo psychiatric unit study (405 patients), traditional practitioners were consulted at some stage by many patients, more often by those on low incomes; prior traditional treatment was not associated with a higher rate of more than six months' delay in seeking psychiatric care. Practical meaning: do not assume harm or ignorance from healer use. [source: Karandawala 2004]
  • Mental illness often goes first to the adura or clergy. A 1983 survey of two Sinhala communities found people consulted the adura and Buddhist clergy first for mental illness, with aduras more prominent in rural areas and monks in urban areas. Practical meaning: ask about monks and temples as well as ritual healers. [source: Wolffers 1988]
  • The family and community are the unit of affliction. In Kapferer's account, illness disturbs family and social order and healing re-orders it. Practical meaning: invite the family's view (with consent) and plan for family dynamics. [source: Sasaki review of Kapferer 1983]
  • Gender matters. Kapferer devotes a chapter to cultural explanations of women's illness, and community legend links a particular yakā to women's illness. Practical meaning: explore gendered meanings, family pressures and safety for women clients. [source: Sasaki review of Kapferer 1983; Sunday Observer]
  • Religion shapes possession experience and help-seeking. Sri Lankan psychiatrists describe Buddhist, Catholic and Muslim patients whose possession experiences and responses to treatment were shaped by their faith. Practical meaning: do not assume all Sri Lankan clients are Buddhist or share tovil beliefs. [source: Hanwella et al. 2012]
  • Consent belongs to the person. Sri Lankan forensic-medicine authors report rituals done without proper consent, with family consenting for the patient, forced restraint and harmful procedures, and little regulatory oversight. Practical meaning: check the client's own consent to any ritual, and act on harm. [source: Dias and Gooneratne 2011]
  • The CFI aids, not replaces, diagnosis. It supports understanding and decisions and is not the only basis for diagnosis. Practical meaning: combine it with standard assessment. [source: APA CFI]
  • Outsider accounts are partial. Much of the scholarship is by outside ethnographers; community voices appear mainly in press and performance schools. Practical meaning: treat the client and community members as the authority on their own practice. [synthesis]
  • No herbs, oils or medicines advice. If a client mentions preparations given alongside ritual care, route questions to the prescriber; never advise starting, stopping or changing medicines. [synthesis]

4. Intervention inventory

All interventions below are the psychotherapist's own. None involves performing, simulating or advising on tovil. Example language is illustrative unless quoted. [source per item]

4.1 Cultural humility and self-examination

  • Purpose / when: before and throughout work with Sinhala or other Sri Lankan clients, especially when you notice reactions such as "superstition" or exoticising fascination. Sri Lankan public debate itself includes strongly hostile framings of ritual healers, which clients may have absorbed or fear. [synthesis; source: Daily Mirror opinion piece, 2015; uncertain: not verified]
  • Steps: (1) Note your own beliefs about spirits, ritual and Buddhism. (2) Note what you know only from outsider ethnography or tourism (masks, performances) and set it aside as partial. (3) Identify what you do not know (region, caste, religion, migration history) and plan to ask. (4) Review in supervision any reaction of contempt, rescue or curiosity that serves you rather than the client. [synthesis]
  • Example language (illustrative): "I don't know much about how your family deals with this kind of trouble. Would you teach me?"
  • Watch for: the client testing whether you will mock them; over-politeness or vagueness about other help (a sign they expect disapproval). Working when the client volunteers details of healer visits unprompted.

4.2 Core Cultural Formulation Interview

  • Purpose / when: first evaluation of any client, and especially when the problem may be framed as spirit or demonic affliction. Designed for any clinician, any setting. [source: APA DSM-5-TR Section III; APA CFI]
  • Steps: cover the four domains in your own order: (1) cultural definition of the problem (Q1–3); (2) perceived causes, stressors, supports and role of cultural identity (Q4–10); (3) self-coping and past help-seeking, including barriers (Q11–13); (4) current help-seeking preferences and the clinician–patient relationship (Q14–16). Use the official APA form; clinicians may reproduce it for patient use, but not modify or translate it without APA permission. Record the client's own words. [source: APA CFI]
  • Example language (illustrative): "People describe problems in different ways. How would you describe what has been happening, to yourself or to your family?" "What do you think caused it? What do others in your family say?"
  • Watch for: the client giving a 'medical' answer first and the family explanation later; shame about naming yakku. Working when the client's own term (e.g. pissu for madness, or a named yakā) appears in their account. [source on pissu: Amarasingham 1980]

4.3 CFI Informant Version with family

  • Purpose / when: when family brought the client, organised a ritual, or hold a different explanation; with the client's consent. [source: APA Informant Version]
  • Steps: (1) Ask the client's permission and what may be shared. (2) Begin with the informant's relationship to the client (Q1), then the same four domains. (3) Note where family and client views differ, especially about who decides on treatment and rituals. [source: APA Informant Version; synthesis for steps 1 and 3]
  • Example language (illustrative): "You know your daughter well. What do you understand is troubling her, and what has the family tried?"
  • Watch for: family speaking over the client; pressure for a ritual the client does not want (Dias and Gooneratne report families consenting on patients' behalf). Working when the client can state their own preference in the family's presence. [source: Dias and Gooneratne 2011]

4.4 Explanatory-model inquiry (Kleinman; CFI Explanatory Model module)

  • Purpose / when: whenever cause is attributed to yakku, a curse, sorcery or other non-biomedical cause, to understand what the client expects any treatment to do. [source: Kleinman et al. 1978 via Tanenbaum handout; APA Supplementary Modules]
  • Steps: ask, in paraphrase of Kleinman's eight questions: what they call the problem; what caused it; why it began when it did; what it does and how it works; how severe it is and how long it will last; what treatment they should get; the main problems it has caused; what they fear most. Then summarise back and ask what you missed. [source: Tanenbaum handout]
  • Example language (illustrative): "Why do you think it started when it did?" "If the demon explanation is right, what would help? And if it is partly stress or illness too, what would help with that?"
  • Watch for: layered models (spirit cause plus stress plus illness) are common in pluralistic settings; do not force a choice. Working when you can name the client's goals for each help source. [source: Amarasingham 1980; synthesis]

4.5 Spirituality, Religion and Moral Traditions module

  • Purpose / when: when Buddhist practice, temple, deities, Christian or Muslim faith, or moral meanings (karma, merit, sin) shape the problem or coping. Sri Lankan patients' possession experiences differ by religion. [source: APA Supplementary Modules; Hanwella et al. 2012]
  • Steps: (1) ask about religious identity and practice; (2) ask how faith explains the problem and helps; (3) ask about religious leaders consulted (monks, priests, imams); (4) ask whether any religious conflict or stigma is present. [source: APA Supplementary Modules; synthesis for ordering]
  • Example language (illustrative): "Does your faith help you with this? Has a monk or the temple been involved?"
  • Watch for: do not assume Buddhism from Sinhala ethnicity or tovil belief from Buddhism. Working when the client draws on religious resources in coping plans.

4.6 Mapping help-seeking and healer consultation without judgement

  • Purpose / when: at intake and at review; to know what other care is happening in parallel. [source: Wolffers 1988; Karandawala 2004; APA Coping and Help-Seeking module]
  • Steps: (1) normalise: many people use several kinds of help. (2) Ask about each: Western doctor or psychiatrist, Ayurvedic physician, ritual healer (adura, kattadiya, yak gurunnanse), monks or other clergy, deity shrines, family remedies. (3) For each, ask what was hoped for, what happened, how the client felt about it, and whether more is planned. (4) Ask about anything taken by mouth or applied, and route medicine questions to the prescriber. [synthesis built on Wolffers 1988 and APA module]
  • Example language (illustrative): "In Sri Lanka many families try several kinds of help, sometimes at the same time. What has your family tried? I ask so we can work together, not to judge."
  • Watch for: concealment if you seem disapproving; ritual plans clashing with medical appointments. Working when the client tells you about planned rituals in advance.

4.7 Cultural concepts of distress

  • Purpose / when: to use DSM-5-TR's framework of idioms, explanations and syndromes for spirit-affliction talk. DSM-5-TR lists examples (e.g. ataque de nervios, dhat syndrome, khyâl cap, kufungisisa, maladi dyab, susto); demonic affliction treated by tovil is not one of the listed examples, so use the general framework. [source: APA DSM-5-TR Section III; UNMC DSM-5-TR slides; exact DSM-5-TR list uncertain]
  • Steps: (1) classify what the client says as idiom (a way of expressing distress), explanation (perceived cause) or syndrome; (2) record it in the cultural formulation; (3) map it to symptoms and functioning without replacing it with a diagnosis; (4) avoid stigmatising or generalising language, as DSM-5-TR revisions emphasise. [source: APA DSM-5-TR Section III]
  • Example language (illustrative): "When you say a yakā has caught you, what does that feel like in your body and in your day?"
  • Watch for: treating the idiom as a delusion by default, or as only metaphor. Working when the formulation holds both the client's meaning and the symptom picture.

4.8 Distinguishing normative possession and trance from disorder

  • Purpose / when: when the client reports possession, being caught or influenced by a yakā, trance during a ritual, or special powers from a deity. [source: Hanwella et al. 2012]
  • Steps: (1) ask whether the experience occurred within a broadly accepted collective cultural or religious practice; DSM criteria exclude trance or possession that is a normal part of such practice. (2) For possession-form DID, check identity disruption with distress or impairment that is not a normal part of accepted practice. (3) For ICD-11 6B62 trance disorder (no alternate identity) and 6B63 possession trance disorder (identity replaced by an external possessing identity), check that states are involuntary and unwanted, recurrent or prolonged, outside accepted practice, and cause distress or impairment. (4) Screen separately for psychosis, mania, depression, PTSD, substance use and organic causes (delirium, epilepsy). (5) Consult a cultural broker or community member on what is normative locally. [source: PMC9199574 on DSM-5 wording; findacode mirror of ICD-11 6B62; synthesis for steps 4–5] DSM-5-TR keeps these exclusions in substance [source: https://umsystem.pressbooks.pub/aswbprep/?p=1299]; that it keeps the exact wording is [uncertain].
  • Example language (illustrative): "In your community, is what happened to you something people expect in certain situations? Did it happen when you wanted, or did it come on its own and frighten you?"
  • Watch for: missing illness (weight loss, confusion, fever, sleeplessness, command hallucinations) because the family frames it as demonic; pathologising sanctioned ritual trance. Working when the client and a cultural informant agree on what is and is not usual.

4.9 Interpreters and cultural brokers

  • Purpose / when: when Sinhala or Tamil is the client's first language, or meanings of ritual terms are unclear. [synthesis]
  • Steps: (1) use a trained interpreter, not family; (2) brief them that spirit-related talk must be rendered as said, not softened; (3) check the interpreter's own community ties and confidentiality; (4) consult a broker (community worker, faith leader) only with consent and without identifying details where possible. [synthesis]
  • Example language (illustrative, to interpreter): "Please translate exactly, including words about spirits or demons. Don't explain or soften them."
  • Watch for: interpreter embarrassment or bias about ritual healing; the client knowing the interpreter socially.

4.10 Collaboration and referral with community healers or clergy (client-led)

  • Purpose / when: when the client wants their ritual healer, monk or priest involved. Sri Lankan authors advocate collaboration between ritual healers and medical professionals within a framework protecting patients' rights. A formal Sri Lankan or diaspora collaboration programme with tovil practitioners is not documented in the sources cited here [uncertain: not verified]. Trial evidence on healer collaboration comes from West Africa, outside Sri Lanka. The COSIMPO cluster randomised trial in Nigeria and Ghana (Gureje et al., The Lancet 2020) found that collaborative care between traditional or faith healers and primary health care workers reduced psychotic symptoms (PANSS) and harmful practices more than usual care [source: https://pubannotation.org/docs/sourcedb/PubMed/sourceid/32861306] [source: https://centreforglobalmentalhealth.org/node/839]. A Ghana prayer-camp trial (Ofori-Atta et al., Br J Psychiatry 212(1)) found that adding psychiatric medication to prayer-camp care reduced symptoms but did not significantly reduce days in chains [source: https://www.mentalhealthdataprizeafrica.aphrc.org/repository/paper/33405/joining-psychiatric-care-and-faith-healing-in-a-prayer-camp-in-ghana-randomised-trial]. [source: Dias and Gooneratne 2011; WHO Traditional Medicine Strategy page]
  • Steps: (1) ask whether the client wants contact and what for; (2) get written consent specifying what may be shared; (3) agree roles: you do not comment on ritual content, the healer is asked not to advise stopping medicines; (4) share safety information (e.g. that the client should keep medical appointments, and warning signs needing a doctor); (5) never refer clients to ritual practitioners yourself or recommend particular ones; legitimacy rests with the client's own community. [synthesis built on Dias and Gooneratne 2011]
  • Example language (illustrative): "If you would like me to speak with the person helping your family, I can, with your permission. I'd want to agree that your medication continues while that help goes on."
  • Watch for: healer advice to stop medication; the healer becoming a channel for family pressure. Working when parallel care runs without conflict.

4.11 Integrating a ritual experience

  • Purpose / when: after the client has taken part in a tovil or other ritual and wants to make sense of it. [synthesis]
  • Steps: (1) ask what it meant to them and their family, in their terms; (2) ask what changed (relief, shame, fear, family relations); (3) explore any frightening moments and physical effects; (4) link helpful meanings to ongoing coping (e.g. family support mobilised, a sense of order restored, which Kapferer's account foregrounds). [source: Sasaki review of Kapferer 1983 for social re-ordering; synthesis]
  • Example language (illustrative): "What was it like for you? What feels different since then, for you and for your family?"
  • Watch for: retraumatisation, restraint or coercion during the ritual; disappointment if it 'failed' and self-blame. Working when the client can hold the experience without shame.

4.12 Work with family and community

  • Purpose / when: family conflict, gendered pressures, or when the family sees the illness as a shared affliction. [source: Sasaki review of Kapferer 1983]
  • Steps: (1) family sessions with consent; (2) map who decides on care; (3) address stigma; (4) agree a joint plan that names both community and clinical routes. [synthesis]
  • Example language (illustrative): "Everyone here wants her to recover. Let's agree what each of us will do, and what would make us call the doctor."
  • Watch for: scapegoating, especially of women and young people; marriage-related pressures. Working when the family supports the agreed plan.

4.13 Safeguarding and medical urgency

  • Purpose / when: any report of forced restraint, beating, burns, deprivation, consent given by others against the client's wishes, delayed urgent treatment, or a child involved. [source: Dias and Gooneratne 2011]
  • Steps: (1) assess immediate risk to life and refer for emergency medical care where needed; (2) follow local adult and child safeguarding procedures and your duty to report; (3) document the client's own consent or refusal; (4) keep respect for the belief separate from tolerance of harm; (5) offer the client safer options within their tradition if they wish (e.g. help from clergy or a healer they trust who does not use force), without choosing for them. [synthesis built on Dias and Gooneratne 2011]
  • Example language (illustrative): "Your beliefs are yours and I respect them. Being held down or hurt is something I have to take seriously, whatever the reason."
  • Watch for: fear of family retaliation; minimisation. Working when the client is safe and still connected to their community.

4.14 Diaspora, migration and services

  • Purpose / when: Sri Lankan clients outside Sri Lanka, including refugees. [source: APA Supplementary Modules (Immigrants and Refugees; Cultural Identity)]
  • Steps: use the Immigrants and Refugees and Cultural Identity modules; ask about access to healers or temples abroad, racism or discrimination in services, and the CFI patient–clinician relationship question (Q16). [source: APA CFI; APA Supplementary Modules]
  • Example language (illustrative): "Has anything about our service, or about me, made it harder to talk about this?"
  • Watch for: the client seeking help from unvetted sources abroad because community healers are unavailable [synthesis]. Working when the client names trusted community resources.

5. Handling problems

Sources address few of these directly; responses are marked.

  • Client hides healer contact, then discloses mid-therapy. Thank them, normalise pluralistic help-seeking, and re-run the help-seeking map (4.6). Do not imply they were wrong. [synthesis; source: Wolffers 1988; Amarasingham 1980]
  • Client asks you whether the demon is real. Do not confirm or dismiss. Reflect their uncertainty and the family's view, and focus on what would help. Illustrative: "I can't speak for what your tradition knows. What I can do is help with the fear and the sleeplessness while you and your family decide about the rest." [synthesis]
  • Family insists on ritual, client is reluctant. Meet the client alone; clarify the client's consent; if adult, support their right to decide; mediate in a family session if they wish. Where coercion or restraint is threatened, follow safeguarding (4.13). [source: Dias and Gooneratne 2011; synthesis]
  • Client wants only ritual help and declines psychiatry for a serious illness. Respect autonomy for capacitous adults, keep the door open, agree warning signs (not eating or drinking, confusion, violence, suicidal talk) that mean emergency care, and involve family with consent. Prior traditional treatment did not by itself predict long delay in one Sri Lankan sample, so keep engagement rather than issuing ultimatums. [source: Karandawala 2004; synthesis]
  • Healer advises stopping medicines. Do not advise on medicines yourself; route urgently to the prescriber and, with consent, ask the prescriber to speak with the client and family. [synthesis]
  • Possession or trance occurs in session. Keep the client and others physically safe, speak calmly by name, do not engage with the possessing identity as an entity or perform any ritual act; afterwards, assess orientation, medical causes and risk, and ask the client how such episodes are usually understood and handled in their family. [synthesis; ICD-11 6B63 framing from PMC9199574]
  • Diagnostic uncertainty persists (culture versus psychosis). Extend assessment, gather informant history, consult a cultural broker and a psychiatrist, and review over time; avoid both premature antipsychotic-focused framing and dismissal of red flags. [synthesis; source: APA CFI on CFI not being the sole basis of diagnosis]
  • Rupture after the client feels judged. Name it, apologise, and use CFI Q16 (clinician–patient relationship) to invite feedback on bias or language barriers. [source: APA CFI; synthesis]
  • Overwhelm or fear after a ritual. Grounding and stabilisation first; explore meaning later (4.11); screen for trauma symptoms if the ritual included restraint or frightening events. [synthesis]
  • Non-adherence to sessions around ritual dates or family obligations. Plan around them; offer flexible scheduling. [synthesis]
  • Clinician over-identifies with or romanticises the tradition. Supervision; remember practice authority lies with hereditary specialists and the client's community, and that the clinician does not advise on or arrange rituals. [synthesis; source: Sunday Observer]
  • Child or young person brought for exorcism-type treatment. Prioritise the child's safety and medical assessment, involve child safeguarding services per local procedure, never name minors in records shared outside the care team beyond what procedures require, and work with parents' beliefs while protecting the child. [synthesis]
  • Gender-based pressure or violence framed as affliction. Assess for domestic abuse privately; plan safety; offer women-specific support. [synthesis; source on gendered explanations: Sasaki review of Kapferer 1983]

Sources

Web sources:

Books and papers cited:

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