S. M. Ayatullahi, C. Muhammad, A. M. Sokoto, M. Mamuda, M. M. Yusuf, and A. U. Muhammad, “OPTIMIZATION OF BIODIESEL PRODUCTION FROM USED OIL OF FISH PROCESOR USING SODIUM METHOXIDE AND SULPHONATED EGG-SHELLS AS CATALYST”, FJS, vol. 7, no. 4, pp. 284 - 292, Aug. 2023.