“Optimasi Portofolio Menggunakan Metode Mean-Variance Dengan L1-Regularization Saham Jakarta Islamic Index (JII)”. Journal of Mathematics UNP 10, no. 4 (February 28, 2026): 16–25. Accessed March 2, 2026. https://jom.ppj.unp.ac.id/index.php/jom/article/view/77.