Passos, P.; Fernandes, R.; Porto, M. Geographical Variation and Taxonomy of the Snail-Eating Snake Dipsas Albifrons (Sauvage, 1884), With Comments on the Systematic Status of Dipsas Albifrons Cavalheiroi Hoge, 1950 (Serpentes: Colubridae: Dipsadinae). Zootaxa 2005, 1013, 19–34.