1. APA (1994) Diagnostic arid Statistical Manual of Mental Disorders, Fourth Edition. American Psychiatric Association, Washington, DC
2. Asherson P, Mant R, McGuffin P (1995) Genetics and schizophrenia. In: Hirsch SR, Weinberger DR (eds) Schizophrenia. Blackwell, Oxford
3. Babigian HM (1980) Schizophrenia: epidemiology. In: Kaplan HI, Freedman AM, Saddock BJ (eds) Comprehensive Textbook of Psychiatry, 3rd ed, vol 2. Williams and Wilkins, Baltimore, pp 1113–1121
4. Bojholm S, Strömgren E (1989) Prevalence of schizophrenia on the island of Bornholm in 1935 and 1983. Acta Psychiatr Scand Suppl 348:157–166
5. Böök JA (1953) A genetic and neuropsychiatric investigation of a North Swedish population (with special regard to schizophrenia and mental deficiency). Acta Genetica 4:1–100