mahmood, Zainab makki. “Building the Optimal Investment Portfolio According to the Simple Gradual Method, With the Shadow of Allowing and Not Allowing Short Selling: An Applied Study in the Iraq Stock Exchange”. Tikrit Journal of Administrative and Economic Sciences 18, no. 60, 3 (December 31, 2022): 500–520. Accessed May 9, 2026. https://www.tjaes.org/index.php/tjaes/article/view/1328.