@article{silva_uieda_2007,  title={Preliminary data on the feeding habits of the freshwater stingrays Potamotrygon falkneri and Potamotrygon motoro (Potamotrygonidae) from the Upper Paraná River basin, Brazil},  volume={7},  ISSN={1676-0603},  url={https://doi.org/10.1590/S1676-06032007000100027},  DOI={10.1590/S1676-06032007000100027},  number={1},  journal={Biota Neotropica},  publisher={Instituto Virtual da Biodiversidade | BIOTA - FAPESP},  author={Silva, Thiago Buosi and Uieda, Virgínia Sanches},  year={2007},  pages={221–226} }