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David, Patrick and Ananjeva, Natalia B. and Das, I. and Golubev, Michael L. (1999) Translation of the Original Description of Vipera obtusa Dwigubsky, 1832 (Serpentes: Viperidae: Viperinae), with Designation of a Neotype. Russian Journal of Herpetology, 6 (3). pp. 193-198. ISSN 1026-2296