Mohamad, Azizah, Azlan Mohd Zain, Razana Alwee, Noordin Mohd Yusof, and Farhad Najarian. 2019. “Optimization of Roundness Error in Deep Hole Drilling Using Cuckoo Search Algorithm”. ELEKTRIKA- Journal of Electrical Engineering 18 (3):44-48. https://doi.org/10.11113/elektrika.v18n3.174.