“Determine of the Efficient Portfolio for Amman Stock Exchange According on Sectorial Diversification : Determine of the Efficient Portfolio”. NTU journal for Administrative and Human Sciences (JAHS) 3, no. 4 (November 11, 2023): 219–236. Accessed November 24, 2024. https://journals.ntu.edu.iq/index.php/NTU-JMS/article/view/765.