P. E. . Vanzolini, “Cercolophia, a new genus for the species of Amphisbaena with a terminal vertical keel on the tail (Reptilia, Amphisbaenia)”, Pap. Avulsos Zool., vol. 37, pp. 401–412, Feb. 1990, doi: 10.11606/0031-1049.1990.37.p401-412.