HADI, Ali Hasan; ERZAIJ, Kadhim Raheim. Determination a Reasonable Concession Period for (PPP) Projects. Civil Engineering Journal, [S. l.], v. 5, n. 6, p. 1235–1248, 2019. DOI: 10.28991/cej-2019-03091328. Disponível em: https://www.civilejournal.org/index.php/cej/article/view/1460. Acesso em: 29 jun. 2025.