Rios-Touma, Blanca, Raúl Acosta, and Narcis Prat. “The Andean Biotic Index (ABI): Revised Tolerance to Pollution Values for Macroinvertebrate Families and Index Performance Evaluation”. Revista de Biología Tropical 62, no. S2 (April 1, 2014): 249–273. Accessed May 6, 2024. https://www.revistas.ucr.ac.cr/index.php/rbt/article/view/15791.