R S, R V, J R. Transesterification of Waste Cooking Oil Catalysed by Crystalline Copper Doped Zinc Oxide Nanocatalyst. JAC [Internet]. 2016 Dec. 22 [cited 2024 May 19];12(12):5798-80. Available from: https://rajpub.com/index.php/jac/article/view/7343