Van Ngo, Dau, and Nguyen Viet Ky. “SMALL DIAMETER PRESSING DRILLING POLE METHOD FOR HIGH BUILDINGS IN HO CHI MINH CITY”. Science and Technology Development Journal 6, no. 5&6 (June 30, 2003): 46-49. Accessed April 8, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3331.