Farashazillah Yahya, Nurul Huda Nik Zulkifli, Hasimi Sallehudin, Nur Azaliah Abu Bakar. “Anomaly Detection for System Log Analysis Using Machine Learning: Recent Approaches, Challenges and Opportunities in Network Forensics”. International Journal of Advanced Science and Technology, Vol. 29, no. 3, Mar. 2020, pp. 12115 -25, http://sersc.org/journals/index.php/IJAST/article/view/30303.