Klein, S. [P:(DE-Juel1)VDB5924] ; Finger, F. [P:(DE-Juel1)130238] ; Carius, R. [P:(DE-Juel1)VDB4964] ; Wagner, H. [P:(DE-Juel1)VDB5911] ; Stutzmann, M. [P:(DE-Juel1)VDB5925]