Xuan Mai, Pham, Van Thi Bong, and Nguyen Huu Huong. “VEHICLES, AIR POLLUTION AND LPG APPLICATION POTENTIAL IN HOCHIMINH CITY”. Science and Technology Development Journal 2, no. 11&12 (December 31, 1999): 41-53. Accessed December 22, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3695.