Agustianingsih, Susi, Rina Reorita, and Renny Renny. “Optimal Control for SIR Model With The Influence of Vaccination, Quarantine and Immigration Factor”. Jurnal Matematika, Statistika dan Komputasi 16, no. 3 (April 28, 2020): 311-324. Accessed May 19, 2024. http://journal.unhas.ac.id/index.php/jmsk/article/view/6942.