R. A. Kawashita-Ribeiro, V. T. de Carvalho, A. C. de Lima, R. W. Ávila, and R. de Fraga, “Morphology and geographical distribution of the poorly known snake Umbrivaga pygmaea (Serpentes: Dipsadidae) in Brazil”, Phyllomedusa, vol. 10, no. 2, pp. 177–182, Oct. 2012, doi: 10.11606/issn.2316-9079.v10i2p177-182.