Tran Van Thang, Vu Huu Chuyen, Do Xuan Hung, Nguyen Anh Tuan, and Pham Thi Hoa. “EFFECTS OF AMPERE, VOLTAGE AND PULSE-ON-TIME ON SURFACE ROUGHNESS IN MACHINING OF C45 STEEL USING EDM MACHINE”. UTEHY Journal of Applied Science and Technology, Vol. 34, June 2022, pp. 55-59, http://tapchi.utehy.edu.vn/index.php/jst/article/view/541.