RAMDATTI, J. L., A. V. Gohil, and K. G. Dave. “Experimental Investigation on Electro-Discharge Surface Modification Phenomenon of P20+Ni Die Steel Using Green P/M Composite Electrode”. Journal of Mechanical Engineering and Sciences, vol. 15, no. 3, Sept. 2021, pp. 8390-04, doi:10.15282/jmes.15.3.2021.16.0660.