RAHIM, S. A.; SALIH, S. O.; HAMDIN, A. O. .; TAHER, H. A. . Predictions the GDP of Iraq by using Grey –Linear Regression Combined Model. The Scientific Journal of Cihan University– Sulaimaniya, [S. l.], v. 4, n. 2, p. 130-139, 2021. DOI: 10.25098/4.2.25. Disponível em: https://journal.sulicihan.edu.krd/index.php/sjcus/article/view/20. Acesso em: 12 feb. 2026.