ميثم ربيع هادي. Simplify the input and portfolio-building measures, hazardous optimal Markowitz model the framework for a single index. IJAS [Internet]. 2025 Feb. 27 [cited 2026 Apr. 18];8(31):87-121. Available from: https://mail.journals.uokerbala.edu.iq/index.php/ijas/article/view/3140