Rios-Touma, B., R. Acosta, and N. Prat. “The Andean Biotic Index (ABI): Revised Tolerance to Pollution Values for Macroinvertebrate Families and Index Performance Evaluation”. Revista De Biología Tropical, vol. 62, no. S2, Apr. 2014, pp. 249–273, doi:10.15517/rbt.v62i0.15791.