DARAJAT, P. P.; CIPTA, B. S. I.; NURUDDIN, I. F.; BALQIS, D. A. I. Dynamical Analysis and Optimal Control of SVIR Hepatitis B Model Spread in Malang. Vygotsky: Jurnal Pendidikan Matematika dan Matematika, [S. l.], v. 5, n. 2, p. 77–90, 2023. DOI: 10.30736/voj.v5i2.698. Disponível em: https://jurnalpendidikan.unisla.ac.id/index.php/VoJ/article/view/698. Acesso em: 22 nov. 2024.