Obahiagbon K, Ahonkhai DO. Optimized Biodiesel Production from Waste Cooking Oil Using Nickel (II) Nitrate Doped Chicken Manure as Catalyst. EJAS [Internet]. 2023Jul.19 [cited 2024Nov.24];11(3):812-24. Available from: http://116.203.177.230/index.php/AIVP/article/view/14891