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Orlov, Nikolai L.; Sergei A. Ryabov, and Nguyen Thien Tao 2009. Two New Species of Genera Protobothrops Hoge et Romano-Hoge, 1983 and Viridovipera Malhotra et Thorpe, 2004 (Ophidia: Viperidae: Crotalinae) from Karst Region in Northeastern Vietnam. Part I. Description of a New Species of Protobothrops Genus. Russian Journal of Herpetology 16 (1)