Rosly, S. S. A., B. Moktar, and M. H. Mohd Razali. “Comparison of Clustering Algorithms on Air Quality Substances in Peninsular Malaysia”. Journal of Computing Research and Innovation, vol. 2, no. 1, Mar. 2017, pp. 36-44, https://jcrinn.com/index.php/jcrinn/article/view/28.