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Bruno R.C. Granier
Dépt. STU, Fac. Sci. Tech., UBO, 6 avenue Le Gorgeu, CS 93837, F-29238 Brest
France
Mohamed Benzaggagh
Department of Geology, Moulay Ismail University, Meknes
Morocco
Serge Ferry
6D avenue Général de Gaulle, F-05200 Briançon
France