Quiñones Huatangari, L., Milla Pino, M.E., Gamarra Torres, O.A., Salas López, R. and Bazán Correa, J.F. 2020. Use of Streeter-Phelps Model to estimate the dissolved oxygen of the Utcubamba River. Ecuadorian Science Journal. 4, 2 (Sep. 2020), 12-16. DOI:https://doi.org/10.46480/esj.4.2.59.