Octavia, Dhita Hartanti, et al. “Modeling Determinants of Composite Stock Price Index Based on Multivariable Nonparametric Penalized Spline Regression Model Alized Spline”. Jurnal Matematika, Statistika Dan Komputasi, vol. 20, no. 3, May 2024, pp. 497-12, doi:10.20956/j.v20i3.32145.