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Utiger, U.; Helfenberger, N.; Schätti, B.; Schmidt, C.; Ruf, M.; Ziswiler, V. 2002 Molecular systematics and phylogeny of Old and New World ratsnakes, Elaphe auct., and related genera (Reptilia, Squamata, Colubridae). Russian Journal of Herpetology 9(2): 105-124.