Hutanu, V. [P:(DE-HGF)0] ; Luberstetter, W. [P:(DE-HGF)0] ; Kobba, A. [P:(DE-HGF)0] ; Sazonov, A. [P:(DE-HGF)0] ; Meven, M. [P:(DE-HGF)0] ; Heger, G. [P:(DE-Juel1)VDB9940] ; Roth, G. [P:(DE-HGF)0]