Usman F, Alkali M. PREPARATION AND CHARACTERIZATION OF BENTONITE CLAY CATALYSTS FOR TRANSESTERIFICATION OF WASTE COOKING OIL INTO BIODIESEL. FJS [Internet]. 2024Apr.30 [cited 2024Jul.22];8(2):204 -211. Available from: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/2347