Yollanda, Mutia, Dodi Devianto, and Putri Permathasari. 2019. “Modeling of Indonesia Composite Index Using Artificial Neural Network and Multivariate Adaptive Regression Spline (retracted)”. Jurnal Matematika MANTIK 5 (2):112-22. https://doi.org/10.15642/mantik.2019.5.2.112-122.