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J. Huisman, . Département-de-mathématiques, C. Laboratoire, and . Umr, mail address: johannes.huisman@univ-brest.fr URL: http://pageperso.univ-brest, Brest cedex 3, p.73376, 29238.

L. Bourget-du-lac-cedex and F. Tel, Fax: +33 (0)4 79 75 81 42 E-mail address: mangolte@univ-savoie.fr URL, +33 (0)4 79 75 86 60