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By: Henrotay, Michel - Marques, Dalia - Nel, André - Gall, Jean-Claude - Paicheler, Jean-ClaudeType: ArticleIn: GéodiversitasVolume: 20Series: 4Issue: 2Date: 1998Page Range: 263--284Publication Info: Paris, Editions scientifiques du Muséum, 1997-Subjects: