Anggriani, Nita, Syamsuddin Toaha, and Kasbawati Kasbawati. “Optimal Control of Mathematical Models on The Dynamics Spread of Drug Abuse”. Jurnal Matematika, Statistika dan Komputasi 17, no. 3 (May 12, 2021): 339-348. Accessed October 8, 2024. https://journal.unhas.ac.id/index.php/jmsk/article/view/12467.