. 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, doi: 10.33003/fjs-2023-0704-1929.