Abubakar, Usman, and Jiya Mohammed. “Coconut-Shell Activated Carbon-Supported CaO for Biodiesel Production from Waste Cooking Oil: Catalyst Preparation and Process-Parameter Screening”. FUDMA Journal of Sciences, vol. 10, no. 22, Oct. 2026, pp. 232-6, https://doi.org/10.33003/fjs-2026-1022-6227.