Bui Khac Khanh, Nguyen Thanh Phu. 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. jst [Internet]. 2024Sep.20 [cited 2025Mar.10];43:52-7. Available from: http://tapchi.utehy.edu.vn/index.php/jst/article/view/731