Castro-Garzón, Hernando, Rodríguez Miranda, Juan Pablo, Rivas Trujillo, Edwin. “Determination of Contamination in the Transept, La Esperanza - Casibare, of the Lower Reaches of the Buquepipe in the City of Villavicencio Meta Colombia”. International Journal of Advanced Science and Technology, Vol. 29, no. 7, July 2020, pp. 11850 -58, http://sersc.org/journals/index.php/IJAST/article/view/27859.