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), [S. l.], v. 3, n. 4, p. 219–236, 2023. DOI: 10.56286/ntujahs.v3i4.765. Disponível em: https://journals.ntu.edu.iq/index.php/NTU-JMS/article/view/765.. Acesso em: 3 jul. 2024.