1. Complex Fluids Laboratory, CNRS-Rhodia, Prospect Plains Road, Cranbury, New Jersey 08512-7500
2. Centre de Recherches d'Aubervilliers, Rhodia, 52, rue de la Haie coq, 93308 Aubervilliers, France
3. Institut C. Sadron (CNRS-ULP), 6 rue Boussingault, 67000 Strasbourg, France