Luge M, Hasibuan RW. Model Epidemik SIR pada Kasus Covid-19 di Provinsi Sumatera Utara. MUST [Internet]. 2022 Dec. 3 [cited 2026 Oct. 3];7(2):2023-210. Available from: https://journal.um-surabaya.ac.id/matematika/article/view/18508