Stepanov, Ivan [P:(DE-HGF)0] ; Ersfeld, Manfred [P:(DE-HGF)0] ; Poshakinskiy, Alexander [P:(DE-HGF)0] ; Lepsa, Mihail [P:(DE-Juel1)128603] ; Ivchenko, Eugeniyus L. [P:(DE-HGF)0] ; Tarasenko, Sergey A. [P:(DE-HGF)0] ; Beschoten, Bernd [P:(DE-Juel1)178028]