Viriyapong, R., and S. Wuttigan. “Stability and Optimal Control of Human T-Cell Lymphotropic Virus Type I (HTLV-I) Infection of CD4+ T-Cells Which Leads to Leukemia Model With Prevention and Treatment”. Thai Journal of Mathematics, vol. 21, no. 3, Sept. 2023, pp. 491–511, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1522.