Gutiérrez-Fonseca, P. e., and C. M. Lorion. “Application of the BMWP-Costa Rica Biotic Index in Aquatic Biomonitoring: Sensitivity to Collection Method and Sampling Intensity”. Revista De Biología Tropical, vol. 62, no. S2, Apr. 2014, pp. 275–289, doi:10.15517/rbt.v62i0.15792.