Le, Hien, Lien Nguyen, and Phuc Do. “Applying OLAP Technology to Support Decision Making in Sales Process”. Science and Technology Development Journal 19, no. 2 (June 30, 2016): 41-57. Accessed May 7, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/727.