ABDEL SALAM, H. A. . A REVIEW OF MAJOR CAUSES OF VARIATION REQUESTS IN THE CONSTRUCTION INDUSTRY . مجلة البحوث الهندسية والعلوم التطبيقية, [S. l.], v. 1, n. الحادي عشر, p. 24, 2023. Disponível em: https://ceh.edu.ly/JERAS/index.php/j/article/view/19. Acesso em: 5 2025.