Mocodompis, Marklif Esriy, Deiby Tineke Salaki, and Djoni Hatidja. 2023. “Application of Nonparametric Spline Regression and Fourier Series to Model Gross Regional Domestic Product in Indonesia”. Jurnal Ilmiah Sains 23 (2):168-74. https://doi.org/10.35799/jis.v23i2.48868.