Balis, D. [P:(DE-HGF)0] ; Zerefos, C. S. [P:(DE-HGF)0] ; Kourtidis, K. [P:(DE-HGF)0] ; Bais, A. F. [P:(DE-HGF)0] ; Hofzumahaus, A. [P:(DE-Juel1)16326] ; Kraus, A. [P:(DE-Juel1)VDB832] ; Schmitt, R. [P:(DE-HGF)0] ; Blumthaler, M. [P:(DE-HGF)0] ; Gobbi, G. P. [P:(DE-HGF)0]