Sharvil D. Shah, Rakesh K. Bumataria, and Harshil V. Bathani. 2015. “Experimental Investigating Of Machining Parameters For EDM Using U-Shaped Electrode Of AISI P20 Tool Steel”. International Journal of Advance Research in Engineering, Science & Technology 2 (4):87-95. https://ijarest.org/index.php/ijarest/article/view/49.