MUHAMMAD GALADIMA, A.; DABAI, M. U.; AHMAD, B. R.; UMAR, J. I. UTILIZATION OF WASTE FOIL AND CARBIDE SLAG AS HETEROGENEOUS CATALYST FOR IN-SITU TRANSESTERIFICATION OF Ricinus Communis (CASTOR SEEDS). FUDMA JOURNAL OF SCIENCES, v. 6, n. 6, p. 303 - 310, 5 Feb. 2023.