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Pérez, M. H. S.; Birindelli, J. L. O. (2013). Hassar shewellkeimi, a New Species of Thorny Catfish (Siluriformes: Doradidae) from the upper Tapajós Basin, Brazil. Proceedings of the Academy of Natural Sciences of Philadelphia. 162(1): 133-156.
Pérez, M. H. S.; Birindelli, J. L. O. (2013). Hassar shewellkeimi, a New Species of Thorny Catfish (Siluriformes: Doradidae) from the upper Tapajós Basin, Brazil. Proceedings of the Academy of Natural Sciences of Philadelphia. 162(1): 133-156.
