Galadima, A. ., M. . Abubakar, R. . Muhammad, and U. . Yusuf. “Heavy Oil Valorization into Lighter Viscous Fuel Using Low-Cost Catalysts”. International Journal of Science for Global Sustainability, vol. 12, no. 2, July 2026, pp. 69-73, doi:10.57233/ijsgs.v12i2.1088.