Hasibuan, A., D. R. . Kembuan, C. T. M. . Manoppo, and M. H. . Tinambunan. “Optimization of K-Means Algorithm in Grouping Data Using the Statistical Gap Method”. Journal of Intelligent Decision Support System (IDSS), vol. 6, no. 3, Aug. 2023, pp. 112-20, doi:10.35335/idss.v6i3.149.