E Andry Dwi Kurniawan, et al. “Model Matematika SEAR Dengan Memperhatikan Faktor Migrasi Terinfeksi Untuk Kasus COVID-19 Di Indonesia”. Limits: Journal of Mathematics and Its Applications, vol. 18, no. 2, Nov. 2022, pp. 142-53, https://journal.its.ac.id/index.php/limits/article/view/5248.