Bui Tuan Anh, Trinh Manh Thang, Bui Duy Thinh. DESIGNING A FOUR-BALL FRICTION MACHINE CONTROL SYSTEM TO EVALUATE THE LUBRICANT QUALITY OF OIL AND ADDITIVE MIXTURE. jst [Internet]. 2023Jun.30 [cited 2024Oct.18];38:21-6. Available from: http://tapchi.utehy.edu.vn/index.php/jst/article/view/604