Houben, L. [P:(DE-Juel1)VDB4944] ; Scholten, C. [P:(DE-Juel1)VDB4963] ; Luysberg, M. [P:(DE-Juel1)130811] ; Vetterl, O. [P:(DE-Juel1)VDB2541] ; Finger, F. [P:(DE-Juel1)130238] ; Carius, R. [P:(DE-Juel1)VDB4964]