DWI NURSYACHBAINI; SUYANTO SUYANTO. The Application of Fuzzy Logic With the Mamdani Method to Determine the Risk Zone for The Spread of Covid-19 in North Sumatra. JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM, [S. l.], v. 2, n. 1, p. 124–137, 2023. DOI: 10.55606/jurrimipa.v2i1.746. Disponível em: https://prin.or.id/index.php/JURRIMIPA/article/view/746. Acesso em: 5 may. 2024.