Aini Fitriyah. “umus ilangan eproduksi asar ovid-19 engan danya aksinasi osis an”. Limits: Journal of Mathematics and Its Applications 19, no. 1 (May 15, 2022): 87–100. ccessed December 6, 2025. https://journal.its.ac.id/index.php/limits/article/view/5373.