Nacy, D.S.M., Al-Rawi, D. and Hasan, M.M. (2017) “A Study Of Strengthening Circular Diaphragm By Ring-Shaped Concentric Ribs”, Al-Khwarizmi Engineering Journal, 2(1), pp. 15–34. Available at: https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/2 (Accessed: 16 December 2025).