Ulfa, Maesaroh, and Sugiyanto Sugiyanto. “Model Matematika Untuk Kontrol Campak Menggunakan Vaksinasi”. Jurnal Fourier 2, no. 2 (October 31, 2013): 81–89. Accessed June 13, 2026. https://mail.fourier.or.id/index.php/FOURIER/article/view/21.