S. Jamali and Y. D. Navaei, “A two-level Product Recommender for E-commerce Sites by Using Sequential Pattern Analysis”, ijie, vol. 8, no. 1, Apr. 2016, Accessed: May 08, 2024. [Online]. Available: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/1330