Santi, Vera Maya, Nia Rahayu Ningsih, and Faroh Ladayya. “ANALYZING OPEN UNEMPLOYMENT RATE IN JAVA USING PENALIZED SPLINE NONPARAMETRIC REGRESSION”. International Journal of Applied Science and Sustainable Development (IJASSD) 4, no. 2 (September 30, 2022): 70–77. Accessed April 26, 2025. https://e-journal.unmas.ac.id/index.php/IJASSD/article/view/4837.