Principal Component–Truncated Spline Regression Modeling of Population Welfare in South Sulawesi. Proximal: Jurnal Penelitian Matematika dan Pendidikan Matematika, [S. l.], v. 9, n. 4, p. 914–924, 2026. DOI: 10.30605/proximal.v9i4.9790. Disponível em: https://e-journal.my.id/proximal/article/view/9790. Acesso em: 24 oct. 2026.