Zapata-Ríos, G., and V. Utreras B. “ Notes on the Distribution of Tucuxi, <i>Sotalia fluviatilis</I> (Cetacea: Delphinidae), in Ecuadorian Amazonia”. Latin American Journal of Aquatic Mammals, vol. 3, no. 1, June 2004, pp. 85-87, doi:10.5597/lajam00054.