Nainggolan, Jonner. “OPTIMAL CONTROL OF INFLUENZA A DYNAMICS IN THE EMERGENCE OF A TWO STRAIN”. BAREKENG: Jurnal Ilmu Matematika dan Terapan 16, no. 3 (September 26, 2022): 835-844. Accessed November 22, 2024. https://ojs3.unpatti.ac.id/index.php/barekeng/article/view/5697.