Palter, Jaime, Sandra León Coto, and Daniel Ballestero. 2007. “The Distribution of Nutrients, Dissolved Oxygen and Chlorophyll a in the Upper Gulf of Nicoya, Costa Rica, a Tropical Estuary”. Revista De Biología Tropical 55 (2):427–436. https://doi.org/10.15517/rbt.v55i2.6022.