Obahiagbon, Kessington, and David Ohimai Ahonkhai. “Optimized Biodiesel Production from Waste Cooking Oil Using Nickel (II) Nitrate Doped Chicken Manure As Catalyst”. European Journal of Applied Sciences 11, no. 3 (July 19, 2023): 812–824. Accessed November 23, 2024. https://journals.scholarpublishing.org/index.php/AIVP/article/view/14891.