1. Achté K (1967) On prognosis and rehabilitation in schizophrenia and paranoid psychosis. A comparative follow-up study of two series of patients first admitted to hospital in 1950 and 1960 respectively. Act Psychiatr Scand 196 (Suppl.)
2. An der Heiden W, Krumm B, Müller S, Weber I, Biehl H, Schäfer M (1995) Mannheimer Langzeitstudie der Schizophrenie.Nervenarzt 66:820–827
3. Beck M (1968) Twenty-five and thirty-five year follow-up first admissions to mental hospital. Can Psychiat Ass J 13:219–229
4. Bland RC, Orn H (1978) 14-year outcome in early schizophrenia. Acta Psychiat Scand 58: 327–338.
5. Bleuler E (1911) Dementia praecox oder Gruppe der Schizophrenien. In: Aschaffenburg G.(Hrsg.) Handbuch der Psychiatrie. Deuticke, Leipzig