Muhammad, Muhammad A., and Rafiaa Ibrahim AL-Hamdani. “The Role of International Diversification in Building the Optimal Investment Portfolio Using the Cut-off Model Analytical Study in a Number of International Markets”. Tikrit Journal of Administrative and Economic Sciences 18, no. 59, 2 (September 30, 2022): 309–326. Accessed January 24, 2026. https://www.tjaes.org/index.php/tjaes/article/view/483.