UsmanF. and AlkaliM. 2024. PREPARATION AND CHARACTERIZATION OF BENTONITE CLAY CATALYSTS FOR TRANSESTERIFICATION OF WASTE COOKING OIL INTO BIODIESEL. FUDMA JOURNAL OF SCIENCES. 8, 2 (Apr. 2024), 204 - 211. DOI:https://doi.org/10.33003/fjs-2024-0802-2347.