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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.