Paul, N. [P:(DE-Juel1)VDB1226] ; Filimonov, S. [P:(DE-Juel1)VDB26536] ; Cherepanov, V. [P:(DE-Juel1)VDB10516] ; Cakmak, M. [P:(DE-HGF)0] ; Voigtländer, B. [P:(DE-Juel1)VDB5601]