Kusmiran, A. P., Salam, N., & Muslim, A. (2026). APPLICATION OF TRUNCATED SPLINE AND FOURIER SERIES IN MODELING THE OPEN UNEMPLOYMENT RATE IN KALIMANTAN ISLAND. BAREKENG: Jurnal Ilmu Matematika Dan Terapan, 20(3), 1821-1836. https://doi.org/10.30598/barekengvol20iss3pp1821-1836