Ali, M. Y., M. M. . Abdul, A. Sabur, and M. Rahman. “Comparative Study of Material Removal Rate of Single-Spark And Multi-Spark Micro-EDM of Copper”. International Journal of Engineering Materials and Manufacture, vol. 7, no. 2, Apr. 2022, pp. 54-60, doi:10.26776/ijemm.07.02.2022.02.