1. National Institute of Research and Physicochemical Analysis (INRAP) Biotechnopole of Sidi Thabet Ariana Tunisia
2. Faculty of Sciences University of Tunis El Manar Tunis Tunisia
3. Institute of Analytical Sciences University of Lyon Villeurbanne France
4. Institute of Polymer Materials University of Lyon Villeurbanne France
5. BAM Federal Institute of Material Research and Testing Berlin Germany
6. Institut für Technische und Makromolekulare Chemie Hamburg Germany