M. Ahsan Ul Haq, Salman Hussain, Wasim Ahmad, Mirza Jahanzaib, Waseem Iqbal and Saira Shehzadi 2018. Optimization of Surface Roughness and MRR in Powder Mix EDM Die-Sink for Inconel 718 using RSM. Journal of Basic & Applied Sciences. 14, (Jan. 2018), 98–106. DOI:https://doi.org/10.6000/1927-5129.2018.14.14.