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Schulz, H. and Dirlich, G. and Balteskonis, S. and Zulley, Jürgen (1980) The REM-NREM sleep cycle: renewal process or periodically driven process? Sleep 2 (3), pp. 319-328.
Dirlich, G. and Zulley, Jürgen and Schulz, H. (1977) The temporal pattern of the REM sleep rhythm. Proceedings of the ... conference of the International Society for Chronobiology 12, pp. 483-493.
Schulz, H. and Dirlich, G. and Zulley, Jürgen (1976) Untersuchungen zur Stabilität ultradianer Rhythmen beim Menschen. (= Studies on the stability of human ultradian rhythms (author's transl.)). Arzneimittel-Forschung = Drug research 26 (6), pp. 1055-1058.
von Zerssen, D. and Dirlich, G. and Zulley, Jürgen (1989) Circadian Rhythm Disturbances in affective disorders - facts and fictions. In: Lerer, Bernard, (ed.) New directions in affective disorders. Springer, New York, pp. 243-250. ISBN 3-540-96769-9, 0-387-96769-9.