Hairol Jefri, H. I. A. .; Mohd Shohaimi, N. A. .; Ibrahim, S. F. .; Mohd Shukri, N. .; Eleburuike, N. A. . Transesterification of Waste Cooking Oil Utilizing Potassium Doped Empty Fruit Bunches Ash Heterogeneous Catalyst. J. Adv. Res. Fluid Mech. Therm. Sc. 2025, 127, 133-147.