Van Ngo, D., and N. Viet Ky. “SMALL DIAMETER PRESSING DRILLING POLE METHOD FOR HIGH BUILDINGS IN HO CHI MINH CITY”. Science and Technology Development Journal, Vol. 6, no. 5&6, June 2003, pp. 46-49, doi:https://doi.org/10.32508/stdj.v6i5&6.3331.