Rajamanickam, S, et al. “Experimental Analysis of Electric Discharge Machining Over Inconel 825 Using Copper Electrode and Al2O3 Coated Copper Electrode”. International Journal of Engineering & Technology, vol. 7, no. 2.33, June 2018, pp. 1302-4, https://doi.org/10.14419/ijet.v7i2.33.18125.