J. Casciotta, A. Almirón, L. Piálek, and O. Říčan, “Cyanocharax obi, a new species (Characiformes: Characidae) and the first record of the genus from tributaries of the río Paraná basin, Argentina”, Zootaxa, vol. 3391, no. 1, pp. 39–51, Jul. 2012.