Achsina, D., & Mardlijah, M. (2021). Analysis Mathematical Model of Radicalization S(Susceptible) E(Extremists) R(Recruiters) I(Immunity) with Optimal Control. (IJCSAM) International Journal of Computing Science and Applied Mathematics, 7(2), 39–44. Retrieved from https://journal.its.ac.id/index.php/ijcsam/article/view/4618