Samsir, A. U., Toaha, S. . and Kasbawati, K. (2021) “Optimal Control of a Mathematical Model of Smoking with Temporary Quitters and Permanent Quitters”, Jurnal Matematika, Statistika dan Komputasi, 18(1), pp. 42-54. doi: 10.20956/j.v18i1.13974.