References

Utiger U, Helfenberger N, Sch├Ątti B, Schmidt C, Ruf M, Ziswiler W. 2002. Molecular systematics and Phylogeny of old Old and New World ratsnakes, Elaphe auct., and related genera (Reptilia, Squamata, Colubridae). Russian Journal of Herpetology 9: 105-124.