Tran Van Thang; Vu Huu Chuyen; Do Xuan Hung; Nguyen Anh Tuan; Pham Thi Hoa. EFFECTS OF AMPERE, VOLTAGE AND PULSE-ON-TIME ON SURFACE ROUGHNESS IN MACHINING OF C45 STEEL USING EDM MACHINE. jst 2022, 34, 55-59.