Kolev, K. [P:(DE-HGF)0] ; Kirchgeßner, N. [P:(DE-Juel1)VDB8902] ; Houben, S. [P:(DE-Juel1)VDB87855] ; Csiszar, A. [P:(DE-Juel1)128805] ; Rubner, W. [P:(DE-Juel1)128837] ; Palm, Ch. [P:(DE-HGF)0] ; Eiben, B. [P:(DE-Juel1)VDB62239] ; Merkel, R. [P:(DE-Juel1)128833] ; Cremers, D. [P:(DE-HGF)0]