Perla Sreenivasa Rao, and Dr. K Ravindra. “Evaluation of Parametric Control for Machining With WEDM and Machinability Index”. Global Journals of Research in Engineering, vol. 15, no. A1, Jan. 2015, pp. 17-21, https://engineeringresearch.org/index.php/GJRE/article/view/1272.