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Berger, M. and Riemann, D. and Wiegand, M. and Joy, D. and Höchli, D. and Zulley, Jürgen (1988) Are REM-Sleep Abnormalities in Depression more than an Epiphenomenon. In: Koella, W. P. and Obal, F., (eds.) Sleep 86: proceedings of the 8. European Congress on Sleep Research, Szeged (Hungary), Sept. 1 - 5, 1986. G. Fischer, Stuttgart, pp. 218-222. ISBN 3-437-11141-8, 0-89574-252-7.
Campbell, S. S. and Zulley, Jürgen (1988) Napping as a biological rhythm: disentrainment of the human sleep/wake system. In: Koella, W. P. and Obal, F., (eds.) Sleep 86: proceedings of the 8. European Congress on Sleep Research, Szeged (Hungary), Sept. 1 - 5, 1986. G. Fischer, Stuttgart, pp. 3-10. ISBN 3-437-11141-8 ; 0-89574-252-7.
Zulley, Jürgen and Campbell, S. S. (1985) The coupling of sleep-wake patterns with the rhythm of body temperature. In: Koella, W. P., (ed.) Sleep '84: proceedings of the 7th European Congress on Sleep Research, Munich, Sept. 3-7, 1984. G. Fischer, Stuttgart, pp. 81-85. ISBN 3-437-10990-1.
Zulley, Jürgen (1981) Comparison of long and short sleep durations in free-running sleep-wake cycles. In: Koella, W. P., (ed.) Sleep 1980; fifth European Congress on Sleep Research, Amsterdam, September 2-5, 1980. Karger, Basel, pp. 202-206. ISBN 3-8055-2045-X.