Aveiga Ortiz, A. M., Noles, P., de la Cruz, A., Peñarrieta, F., & Alcántara, F. (2019). Variations of the water quality of the Carrizal River in Manabi. Enfoque UTE, 10(3), pp. 30 – 41. https://doi.org/10.29019/enfoque.v10n3.423