Akbar, F., Dekapriyo, E. L., Haris, A. M., & Moefad, A. M. (2022). Grouping of the Second Wave of Covid-19 Infection Areas in East Java Province Using K-Means Clustering. Jurnal Matematika MANTIK, 8(1), 53–62. https://doi.org/10.15642/mantik.2022.8.1.53-62