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D. Li, EA 2462 & Fédération CNRS Nord-Pas-de-Calais FR 2956, Faculté des Sciences

H. Queffélec, U. Lille-nord-de-france, U. , L. Paul-painlevé, U. M. Villeneuve-d-'ascq-cedex et al., CNRS 8524 & Fédération CNRS Nord-Pas-de-Calais FR 2956, F-59 655Queffelec@univ-lille1.fr Luis Rodríguez-Piazza, p.80