WIDAYATI, Ratna. Global Stability of Covid-19 Disease Free Based on Sivrs Model. Jurnal Matematika, Statistika dan Komputasi, [S. l.], v. 19, n. 2, p. 400–411, 2023. DOI: 10.20956/j.v19i2.24386. Disponível em: https://journal.unhas.ac.id/index.php/jmsk/article/view/24386. Acesso em: 22 dec. 2024.