NnajiJ. C., and OnyezekaE. G. “CHARACTERIZATION AND ESTERIFICATION OF VARIOUS WASTE FRYING OILS AS FEEDSTOCKS FOR BIODIESEL PRODUCTION”. FUDMA JOURNAL OF SCIENCES, Vol. 3, no. 4, Apr. 2023, pp. 321 -27, https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1654.