1. American Psychiatric Association (1987) Diagnostic and statistical manual of mental disorders-DSM-III-R, 3rd rev. edn American Psychiatric Association Washington
2. Aussilloux C, Collery F, Roy J (1989) Epidémiologie de l'autisme infantile dans le département de l'Hérault. Rev Fr Psychiatrie 7: 24?28
3. Bohman M, Bohman IL, Björck PO, Sjöhlm E (1983) Childhood psychosis in a northern Swedish county: some preliminary findings from an epidemiological survey. In: Schmidt MH, Remschmidt H (eds) Epidemiological approaches in child psychiatry. Thieme Stuttgart, pp 164?173
4. Bolton P, Rutter M (1990) Genetic influences in autism. Int Rev Psychiatry 2: 65?78
5. Brask BH (1972) A prevalence investigation of childhood psychoses. In: Nordic Symposium on the Care of Psychotic Children Barnepsychiatrist Forenin, Oslo