Forero, Laura, Magnolia Longo, John Ramírez R., and Guillermo Chalar. “Aquatic Ecological Index Based on Freshwater (ICERN-MAE) for the Río Negro Watershed, Colombia.”. Revista de Biología Tropical 62 (April 1, 2014): 233-247. Accessed January 23, 2022. https://revistas.ucr.ac.cr/index.php/rbt/article/view/15790.