Duncan, W.P. & da Costa, O.T.F. & Sakuragui, M.M. & Fernandes, M.N. (2010)
Functional morphology of the gill in amazonian freshwater stingrays (Chondrichthyes: Potamotrygonidae): implications for adaptation to freshwater. Physiological and Biochemical Zoology, 83(1), 19–32
DOI: 10.1086/605458