Justice Panggabean, M., Molliq Rangkuti, Y. and Muslim Karo-Karo, I. (2023) “Design of a geographic information system (gis) for the spread of covid-19 disease in medan city”, Jurnal Mantik, 6(4), pp. 3726-3736. doi: 10.35335/mantik.v6i4.3437.