Flores, Miguel, Ana Escobar, Luis Horna, and Lucia Carrión. “Estimation of the Contaminant Risk Level of Petroleum Residues Applying FDA Techniques”. Latin-American Journal of Computing 4, no. 2 (November 1, 2017): 13 - 18. Accessed May 8, 2024. https://lajc.epn.edu.ec/index.php/LAJC/article/view/139.