Annas, Suwardi, Aswi Aswi, and Rahmat Hidayat. 2026. “Determinants of Maternal Mortality in Indonesia: A B-Spline Nonparametric Regression Approach to Identify Nonlinear Relationship Patterns”. Mathline : Jurnal Matematika Dan Pendidikan Matematika 11 (1):31-44. https://doi.org/10.31943/mathline.v11i1.1015.