Obahiagbon K, Ahonkhai DO. Optimized Biodiesel Production from Waste Cooking Oil Using Nickel (II) Nitrate Doped Chicken Manure as Catalyst. EJAS [Internet]. 2023 Jul. 19 [cited 2026 May 30];11(3):812-24. Available from: https://scholarpublishing.org/journals/index.php/EJAS/article/view/8496