Wali Ullah, Naseer Ahmed Khan, Naveed ul Hasan Syed, and Muddasar Habib, trans. 2021. “A Comparison Study of the Metal Oxide Catalysts for the Conversion of Used Cooking Oil into High Grade Chemicals”. Pakistan Journal of Analytical & Environmental Chemistry 22 (1): 150-58. https://doi.org/10.21743/pjaec/2021.06.15.