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Schulz, H. and Zulley, Jürgen (1981) The consistency and persistency of the REM-NREM sleep rhythm. In: Karacan, Ismet, (ed.) Psychophysiological aspects of sleep: proceedings. Proceedings of the international congress of sleep research, 33. Noyes Medical Publ., Park Ridge, N.J., pp. 40-47. ISBN 0-8155-0858-1.