Trong Duc, Tran. “A FLEXIBLE APPROACH FOR CALCULATING COMPENSATION IN PLANNING PROJECT USING GEOGRAPHIC INFORMATION SYSTEM”. Science and Technology Development Journal 7, no. 10 (October 31, 2004): 51-57. Accessed May 19, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3265.