Hofstadler-Deiques, C. and de Lema, T. (2005) “On the cranial morphology of Elapomorphus, Phalotris and Apostolepis (Serpentes: Colubridae), and its phylogenetic significance”, Zootaxa. Auckland, New Zealand, 1042(1), pp. 1–26. doi: 10.11646/zootaxa.1042.1.1.