Córdoba Muñoz, R. “Primary Productivity in the Water Column of Estero Morales, a Mangrove System in the Gulf of Nicoya, Costa Rica”. Revista De Biología Tropical, vol. 46, no. S6, Dec. 1998, pp. 257–262, https://revistas.ucr.ac.cr/index.php/rbt/article/view/29884.