مروة عبد الستار جبار; ميثم ربيع هادي. Solving the system of simultaneous equations as a simplifying method of Markowitz model to build the optimal stock portfolio when short selling is allowed: Analytical study of the Iraqi Stock Exchange. Iraqi Journal for Administrative Sciences, كربلاء، جمهورية العراق, v. 17, n. 70, p. 25–51, 2024. Disponível em: https://mail.journals.uokerbala.edu.iq/index.php/ijas/article/view/1888. Acesso em: 7 jan. 2025.