Hong Ngan, Nguyen, and Nguyen Chi Nghia. “STUDIES OF THE OPTIMIZED WORKING-PARAMETERS OF A LIGHT IMPACT-VIBRATION HAMMER MODEL”. Science and Technology Development Journal 5, no. 7&8 (August 31, 2002): 20-27. Accessed July 22, 2024. https://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/3424.