NLERUM, Promise Anebo; ELEJE, Chinwendu Best. MULTILEVEL VERIFICATION SYSTEM FOR MITIGATING CYBER RISKS IN UPSTREAM OPERATIONS OF SMART OILFIELDS. FUDMA JOURNAL OF SCIENCES, [S. l.], v. 9, n. 11, p. 335 – 344, 2025. DOI: 10.33003/fjs-2025-0911-4007. Disponível em: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/4007. Acesso em: 8 nov. 2025.