Laumer, W. [P:(DE-Juel1)129220] ; Andreu, L. [P:(DE-Juel1)VDB71222] ; Helle, G. [P:(DE-Juel1)VDB3527] ; Schleser, G. H. [P:(DE-Juel1)VDB1420] ; Wieloch, T. [P:(DE-Juel1)VDB86088] ; Wissel, H. [P:(DE-Juel1)VDB50316]