Passos, Paulo, et al. “ A New Species of Atractus (Serpentes: Dipsadidae) from Serra Do Cipó, Espinhaço Range, Southeastern Brazil, With Proposition of a New Species Group to the Genus ”. Papéis Avulsos De Zoologia, vol. 53, no. 6, Jan. 2013, pp. 75-85, https://doi.org/10.1590/S0031-10492013000600001.