Morales-Betancourt, Mónica Andrea, and Carlos Andrés Lasso-Alcalá. 2016. “Proposal of a Non-Lethal Visual Census Method to Estimate Freshwater Stingray Abundance”. Universitas Scientiarum 21 (1):23-32. https://doi.org/10.11144/Javeriana.SC21-1.poan.