Auliya, Yudha Alif, Wayan Firdaus Mahmudy, and Sudarto Sudarto. “Improve Hybrid Particle Swarm Optimization and K-Means for Clustering”. Journal of Information Technology and Computer Science 4, no. 1 (June 27, 2019): 42–56. Accessed August 19, 2022. https://jitecs.ub.ac.id/index.php/jitecs/article/view/83.