Saifudin T, Suliyanto S, Nugraha GC, Valida H, Nahar MH, Fortunata R. MODELING DEMOCRACY INDEX IN INDONESIA WITH MULTIVARIATE ADAPTIVE REGRESSION SPLINE APPROACH. BAREKENG: J. Math. & App. [Internet]. 1Sep.2025 [cited 4Oct.2025];19(4):2347-58. Available from: https://ojs3.unpatti.ac.id/index.php/barekeng/article/view/16630