Suhariman, Fikrianto, Agung Prabowo, and Ari Wardayani. “Determining The Optimal Portfolio Markowitz Model on Moving Stock Prices Using Brown Motion Geometry”. Operations Research: International Conference Series 4, no. 3 (September 5, 2023): 87–92. Accessed January 14, 2026. https://www.iorajournal.org/index.php/Orics/article/view/253.