1. 1. Mandelt A. J. Coming of Middle Age A Journey. New York: Summit 1977 50-57.
2. 2. Leonard G. The Ultimate Athlete. New York: The Viking Press 1975.
3. 3. Sheehan G. A. Advice and Philosophy for Runners. New York: Simon and Schuster 197S.
4. 4. Bunney W. E. Murphy D. L Goodwin F. K. and Borge G. F. The switch process from depression to mania: relationship to drugs which alter brain amines. Lancet 1 (1970) 1022-1027.
5. 5. Gjessing R. and Gjessing L. Some main trends in the clinical aspects of periodic catatonia. Acta Psychiatr. Scand. 37 (1%1) 1-13.