56For more on symposium, read Divic, M. J., Arnd, H. J.: Psychiatry-Symposium 19th World Congress of Psychiatry in Mexico,1971 -- Psychiatry of Disaster Survivors -- A 6-year clinical follow-up study. Amsterdam, Excerpta Medica -- Ilesvier, NY 1973, Lecturers: Josif M. Divic and Hans J. Arndt