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Landgrebe, M. and Nyuyki, K. and Frank, E. and Steffens, T. and Hauser, S. and Eichhammer, P. and Hajak, G. and Langguth, B. (2008) Effects of colour exposure on auditory and somatosensory perception - hints for cross-modal plasticity. Neuroendocrinology Letters (29), pp. 303-311.
Hajak, G. and Geisler, Peter and Rüther, E. (1992) Pharmakatherapie von Schlafstörungen. In: Geisler, Peter and Klein, H., (eds.) Aktuelle Aspekte der Schlafmedizin. Roderer, Regensburg, pp. 83-107. ISBN 3-89073-600-9.