Sumardi, Sitti Rosnafian, and Muhammad Hisyam. “Development of a SEIR Model With Two Optimal Controls for Infectious Disease Control: Computational Simulation Using MATLAB”. Vygotsky: Jurnal Pendidikan Matematika dan Matematika 8, no. 1 (February 28, 2026): 21–30. Accessed November 8, 2026. https://jurnalpendidikan.unisla.ac.id/index.php/VoJ/article/view/1293.