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Herrmann, H.W.; Joger, U.; Nilson, G. 1992 Molecular phylogeny and systematics of viperine snakes. 1. General phylogeny of European vipers (Vipera sensu stricto). pp. 219-224. In: Korsos, Z. & Kiss, I. (eds.): Proceedings of the 6th Ordinary General Meeting of the Societas Europaea Herpetologica, 19-23 August 1991, Budapest, Hungary. Hungarian Natural History Museum, Budapest. 531 pp.