Samsir, Andi Utari, Syamsuddin Toaha, and Kasbawati Kasbawati. “Optimal Control of a Mathematical Model of Smoking With Temporary Quitters and Permanent Quitters”. Jurnal Matematika, Statistika dan Komputasi 18, no. 1 (September 2, 2021): 42–54. Accessed December 22, 2024. https://journal.unhas.ac.id/index.php/jmsk/article/view/13974.