Hajek, A. ; Bock, J-O ; Saum, K-U [P:(DE-HGF)0] ; Schöttker, B. [P:(DE-He78)c67a12496b8aac150c0eef888d808d46] ; Brenner, H. [P:(DE-He78)90d5535ff896e70eed81f4a4f6f22ae2] ; Heider, D. ; König, H-H