H. A. Kasdirin, S. K. Ali, and M. Tokhi, “Spread enhancement for firefly algorithm with application to control mechanism of exoskeleton system”, Mekatronika : J. Intell. Manuf. Mechatron., vol. 1, no. 1, pp. 27–34, Jan. 2019, Accessed: Mar. 14, 2025. [Online]. Available: https://journal.ump.edu.my/mekatronika/article/view/163