Parra, Tania, Freddy Alexander Marin Sinche, Gonzalo Jácome, and Marco Sinche. 2018. “Clarification of Used Cooking Oil and Discoloration of Red Palm Oil With the Use of Ozone, Activated Carbon and Hydrogen Peroxide”. Enfoque UTE 9 (2):pp. 77 - 88. https://doi.org/10.29019/enfoqueute.v9n2.192.