Jonard, M. [P:(DE-HGF)0] ; André, F. [P:(DE-Juel1)VDB85547] ; Giot, P. [P:(DE-HGF)0] ; Weissen, F. [P:(DE-HGF)0] ; Van der Perre, R. [P:(DE-HGF)0] ; Ponette, Q. [P:(DE-HGF)0]