TARIGAN , wanra .; THAMRIN, T.; SEMBIRING, L.; SILALAHI, H. .; SEMBIRING, I. MAPPING PATTERNS OF THE SPREAD OF COVID-19 IN MEDAN CITY IN EFFORTS TO IMPROVE HEALTH SERVICE ACTIONS TO COMMUNITIES EXPOSED TO THE COVID-19 VIRUS USING THE APRIORI ALGORITHM METHOD. Jurnal Mantik, [S. l.], v. 5, n. 2, p. 1294-1304, 2021. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/1514. Acesso em: 30 jul. 2026.