1. a Insto. Ciencia de Materiales de Madrid-CSIC , Cantoblanco, IRL , E-28049 , Madrid
2. b NMRC , Lee Maltings, Prospect Row , Cork
3. c Ceramics Laboratory, EPFL , Swiss Federal Institute of Technology , Lausanne , CH-1015
4. d JIPELEC. 11 , Chemin du Vieux Chene , Meylan , F-38240