Kleist, E. [P:(DE-Juel1)129345] ; Folkers, A. [P:(DE-Juel1)VDB47479] ; Heiden, A. C. [P:(DE-Juel1)VDB578] ; Langenbartels, Ch. [P:(DE-HGF)0] ; Wildt, J. [P:(DE-Juel1)VDB1780]