Padilla Moreno, Rafael Mauricio, and Carlos Alberto Ospina Parra. 2021. “Biological and Physiochemical Conditions of the Surface Waters of the Cauca River in the Urban Area of Popayán, Colombia”. Revista Ingenierías Universidad De Medellín 20 (39), 263-77. https://doi.org/10.22395/rium.v20n39a15.