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J. Huisman, C. Département-de-mathématiques, and . Umr, E-mail address: johannes.huisman@univ-brest.fr URL: http://fraise.univ-brest.fr/?huisman Frédéric Mangolte, Brest cedex 3, France. Tel. +33 2 98 01 61 98 Laboratoire de Mathématiques, p.33, 29238.