1. Institut für
Physik −
NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Str. 7, D-06120 Halle, Germany
2. Department of Materials, Loughborough University, Loughborough, LE11 3TU, U.K.
3. The Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The
Netherlands