Anggriani, Nita, Syamsuddin Toaha, and Kasbawati Kasbawati. 2021. “Optimal Control of Mathematical Models on The Dynamics Spread of Drug Abuse”.
Jurnal Matematika, Statistika Dan Komputasi
17 (3):339-48. https://doi.org/10.20956/j.v17i3.12467.