alhadithi, Wissam, Hafth I. Naji, and Raquim N. Zehawi. “Identifying the Key Causes and Impacts of Variation Orders in Iraqi Construction Projects”. Diyala Journal of Engineering Sciences 14, no. 2 (June 16, 2021): 18–27. Accessed July 7, 2024. https://mail.djes.info/index.php/djes/article/view/785.