In Press.Proof corrected by the author Available online since Saturday 8 November 2008
J.P. Lefaucheur, J.J. Labat, G. Amarenco, A.G. Herbaut, D. Prat-Pradal, J. Benaim, B. Aranda, M.C. Arne-Bes, V. Bonniaud, P.M. Boohs, K. Charvier, F. Daemgen, P. Dumas, J.P. Galaup, S. Sheikh Ismael, J. Kerdraon, P. Lacroix, D. Lagauche, E. Lapeyre, M. Lefort, A.M. Leroi, R.J. Opsomer, B. Parratte, J.G. Prévinaire, P. Raibaut, J.Y. Salle, M.C. Scheiber-Nogueira, J.M. Soler, M.F. Testut, C. Thomas