Melati, Melati Puspita Sari Lubis, Rina Widyasari, and Rima Aprilia. “Pemodelan Angka Harapan Hidup Sumatera Utara Menggunakan Regresi Semi Parametrik Spline ”. Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika 7, no. 1 (February 2, 2024): 190–196. Accessed July 8, 2025. https://www.e-journal.my.id/proximal/article/view/3350.