Bui Khac Khanh and Nguyen Thanh Phu (2024) “RESEARCHING ON EFFECT OF d/D AND H/D RATIOS TO MACHING FORCE IN BACKWARD EXTRUSION TECHNOLOGY FOR PIPE PARTS FROM HIGH - STRENGTH LOW ALLOY - STEEL”, Journal of Applied Science and Technology, 43, pp. 52-27. Available at: https://jst.utehy.edu.vn/index.php/jst/article/view/731 (Accessed: 15November2025).