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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.