1. Kraeplin, E. Compendium der Psychiatrie zum Gebrauch fuer Studierende und Aerzte (Abel Verlag, Leipzig, 1883).
2. Papousek, M. [Chronobiological aspects of cyclothymia (author's transl)]. Fortschr. Neurol. Psychiatr. Grenzgeb. 43, 381–440 (1975).
3. Wehr, T. A., Sack, D., Rosenthal, N., Duncan, W. & Gillin, J. C. Circadian rhythm disturbances in manic-depressive illness. Fed. Proc. 42, 2809–2814 (1983).
4. Wirz-Justice, A., Puhringer, W. & Hole, G. Sleep deprivation and clomipramine in endogenous depression. Lancet 2, 912 (1976).
5. Wirz-Justice, A. et al. Sleep deprivation: effects on circadian rhythms of rat brain neurotransmitter receptors. Psychiatry Res. 5, 67–76 (1981).