Tarigan , wanra, Thamrin Thamrin, Lismardiana Sembiring, Harlen Silalahi, and Iswanto Sembiring. “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 5, no. 2 (August 30, 2021): 1294-1304. Accessed October 28, 2026. https://www.iocscience.org/ejournal/index.php/mantik/article/view/1514.