Gómez-Salazar, C., M. Portocarrero-Aya, F. Trujillo, S. Caballero, J. Bolaños-Jiménez, V. Utreras, T. Mcguire, A. Ferrer-Pérez, M. Pool, and E. Aliaga-Rossel. “Update on the Freshwater Distribution of <i>Sotalia</i> In Colombia, Ecuador, Peru, Venezuela and Suriname”. Latin American Journal of Aquatic Mammals, vol. 8, no. 1-2, Dec. 2010, pp. 171-8, doi:10.5597/lajam00166.