[1]
P. A. Carrasco, M. B. Harvey, and A. M. Saravia, “The rare Andean pitviper Rhinocerophis jonathani (Serpentes: Viperidae: Crotalinae): redescription with comments on its systematics and biogeography”, Zootaxa, vol. 2283, no. 1, pp. 1–15, Nov. 2009.