Silva, João Paulo C.B. da, and Marcelo R. de Carvalho. “ A New Species of Neotropical Freshwater Stingray of the Genus Potamotrygon Garman, 1877 from the Río Madrede Díos, Peru (Chondrichthyes: Potamotrygonidae) ”. Papéis Avulsos De Zoologia, vol. 51, no. 8, Jan. 2011, pp. 139-54, https://doi.org/10.1590/S0031-10492011000800001.