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Status of a large population of the Adder Vipera berus (Linnaeus, 1758) introduced in eastern Belgium ; Statut d'une vaste population de Vipère péliade Vipera berus (Linnaeus, 1758...
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Phenotypic variations and melanism in an introduced population of the adder Vipera berus in eastern Belgium ; Variations phénotypiques et mélanisme au sein d'une population introdu...