Nlerum, Promise Anebo, and Chinwendu Best Eleje. “MULTILEVEL VERIFICATION SYSTEM FOR MITIGATING CYBER RISKS IN UPSTREAM OPERATIONS OF SMART OILFIELDS”. FUDMA JOURNAL OF SCIENCES, vol. 9, no. 11, Nov. 2025, pp. 335 – 344, https://doi.org/10.33003/fjs-2025-0911-4007.