M. C. Castellanos Corredor, N. del P. Becerra Mora, L. Carreño Nury, and L. P. Páez Cepeda, “COMPARATIVE STUDY OF THE FLOCCULANT ACTION OF Opuntia ficus indica MUCILAGE BY TWO METHODS: COAGULATION AND ELECTROCOAGULATION IN THE LEACHATES OF PIRGUA LANDFILL IN TUNJA”, Rev. AIDIS ing. cienc. ambient., vol. 5, no. 1, pp. 44–55, Apr. 2012.