Almeida, M.P. & Barthem, R.B. & Viana, A.S. & Charvet-Almeida, P. (2009)
Factors affecting the distribution and abundance of freshwater stingrays (Chondrichthyes: Potamotrygonidae) at Marajó Island, mouth of the Amazon River.
Pan-American Journal of Aquatic Sciences, 4(1), 1–11
Almeida, M.P. & Viana, A.S. & Charvet-Almeida, P. & Barthem, R.B. (2005)
Reproductive biology of Potamotrygon scobina Garman, 1913 (Chondrichthyes: Potamotrygonidae) in the Marajó Bay region, Pará, Brazil [Abstract].
American Elasmobranch Society 21th Annual Meeting, Tampa, Florida