YEHYA, M.; ABDULLAH, M. The Use of (2SLS) and (3SLS) Methods to Estimate the Simultaneous Equations System of the World Prices of the Grains for the Period (1961-2002). TANMIYAT AL-RAFIDAIN, [S. l.], v. 31, n. 93, p. 325–343, 2009. DOI: 10.33899/tanra.2009.161841. Disponível em: https://edusj.uomosul.edu.iq/index.php/tanmiyat/article/view/29589. Acesso em: 10 sep. 2025.