R, S., R, V., R, V. and J, R. 2017. Transesterification of Waste Cooking Oil Catalysed by Crystalline Copper Doped Zinc Oxide Nanocatalyst. JOURNAL OF ADVANCES IN CHEMISTRY. 12, 27 (Jan. 2017), 5798–5808. DOI:https://doi.org/10.24297/jac.v12i27.5286.