Cassel, D. [P:(DE-HGF)0] ; Pickartz, G. [P:(DE-HGF)0] ; Siegel, M. [P:(DE-Juel1)VDB3105] ; Goldobin, E. [P:(DE-Juel1)VDB3106] ; Kohlstedt, H. [P:(DE-Juel1)VDB3107] ; Brinkman, A. [P:(DE-Juel1)VDB3108] ; Golubov, A. A. [P:(DE-HGF)0] ; Kupriyanov, M. Y. [P:(DE-HGF)0] ; Rogalla, H. [P:(DE-HGF)0]