1. Alström, C.H.: Mortality in mental hospitals with especial regard to tuberculosis. Acta psychiat., Suppl. 24 (1942).
2. Arentsen, K., Strömgren, E.: Patients in Danish psychiatric hospitals. Acta Jutlandica, Med. ser. No 9 (1959).
3. Astrup, Chr., Ødegard, Ø.: The incidence of psychoses in migrants and non-migrants in Norway 1958–1963. Brit. J. Soc. Psychiat. 4, 101–109 (1970).
4. Berne, Eric: A psychiatric census of the South Pacific. Amer. J. Psychiat. 117, 44 (1960).
5. Book, A. J.: A genetic and neuropsychiatric investigation of a North-Swedish population. Acta genet. (Basel) 4, 1–100 (1953).