Phương, Nguyễn Duy, and Từ Minh Phương. “A Collaborative Filtering Algorithm for Sparse Data”. Journal of Computer Science and Cybernetics 24, no. 1 (July 10, 2012): 62–74. Accessed November 22, 2024. https://vjs.ac.vn/index.php/jcc/article/view/1229.