Mutmainna, Ainul, Nurwahidah Nurwahidah, and Sri Dewi Anugrawati. “Stock Portfolio Optimization Using Single Index Model (SIM) With Exponentially Weighted Moving Average (EWMA) Approach”. EIGEN MATHEMATICS JOURNAL 7, no. 2 (December 14, 2024): 130–138. Accessed December 22, 2024. https://eigen.unram.ac.id/index.php/eigen/article/view/247.