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Ananjeva, N.B.; Orlov, N.L.; Khalikov, R.G.; Darevsky, I.S.; Ryabov, S.A.; Barabanov, A.V. 2006 The reptiles of northern Eurasia: taxonomic diversity, distribution, conservation status. [Pensoft Series Faunistica No 47]. Pensoft Publishers, Sofia. 245 pp.