“Forming An Optimal Portfolio by Applying the Data Envelopment Analysis (DEA) Approach Based on The Single Index Model”, ACP-SS, vol. 1, no. 1, pp. 1–8, Dec. 2024, Accessed: Jul. 27, 2026. [Online]. Available: https://www.proceedings.asteec.com/index.php/acp-ss/article/view/57