Side S, Irwan I, Rifandi M, Pratama M, Ruliana R, Hamid NZ. Optimum Control of SEIR Model on COVID-19 Spread with Delay Time and Vaccination Effect in South Sulawesi Province. Jurnal Varian [Internet]. 13Nov.2022 [cited 27Apr.2024];6(1):11 -24. Available from: https://journal.universitasbumigora.ac.id/index.php/Varian/article/view/1882