Tran The Van, Nguyen Van Thanh. A MANUFACTURING METHOD FOR GENERATING A VARIABLE-PITCH ROTOR OF TWIN-SCREW CACUUM PUMP. jst [Internet]. 2018Apr.11 [cited 2024Dec.27];17:8-13. Available from: http://jst.utehy.edu.vn/index.php/jst/article/view/121