Mat Deris, Ashanira, Azlan Mohd Zain, Roselina Sallehuddin, and Safian Sharif. 2019. “Modeling and Optimization of Electric Discharge Machining Performances Using Harmony Search Algorithm”. ELEKTRIKA- Journal of Electrical Engineering 18 (3-2):56-61. https://doi.org/10.11113/elektrika.v18n3-2.191.