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Schulz, H. and Wilde-Frenz, J. and Volk, S. and Geisler, Peter (1992) Narcolepsy and the pathological aspects of multiple napping. In: Stampi, C., (ed.) Why we nap: Evolution, chronobiology, and functions of polyphasic and ultrashort sleep. Birkhäuser, Basel, pp. 258-270. ISBN 3-7643-3462-2, 0-8176-3462-2.