Heers, S. [P:(DE-Juel1)VDB72752] ; Mavropoulos, Ph. [P:(DE-Juel1)130823] ; Lounis, S. [P:(DE-Juel1)VDB37196] ; Zeller, R. [P:(DE-Juel1)131057] ; Blügel, S. [P:(DE-Juel1)130548]