1. Laboratory of Polymer Chemistry, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
2. Department of Mathematics and Computer Science, Eindhoven University of Technology, P.O. Box 513, 5600
MB, Eindhoven, The Netherlands
3. BASF AG, D-67056, Ludwigshafen, Germany