Green, O.O., S.M. Yusuf, M.B. Abdulrazaq, B. Yahaya, Z. Haruna, A. Ore-Ofe, S.O. Omogoye, A.S. Adegoke, and S.O. Salami. “Anomaly Detection in a Portal System Network: A Review of Techniques, Challenges, and Future Directions”. European Scientific Journal, ESJ 430 (July 27, 2025): 638. Accessed August 3, 2025. https://eujournal.org/index.php/esj/article/view/19810.