Pérez Naranjo, Cristina Gabriela, et al. “AnáLisis of Major Cations in Bottom Sediments from Oil Impacted Rivers, in the Ecuadorian Amazon”. ACI Avances En Ciencias E Ingenierías, vol. 7, no. 2, Dec. 2015, https://doi.org/10.18272/aci.v7i2.271.