Schumacher, D. [P:(DE-HGF)0] ; Steffen, A. [P:(DE-Juel1)141865] ; Voigt, J. [P:(DE-Juel1)131018] ; Schubert, Jürgen [P:(DE-Juel1)128631] ; Brückel, Th. [P:(DE-Juel1)130572] ; Ambaye, H. [P:(DE-HGF)0] ; Lauter, V. [P:(DE-HGF)0]