NACY, Dr. Somer M.; AL-RAWI, Dr.Hikmat; HASAN, Mohammed M. A Study Of Strengthening Circular Diaphragm By Ring-Shaped Concentric Ribs. Al-Khwarizmi Engineering Journal, [S. l.], v. 2, n. 1, p. 15–34, 2017. Disponível em: https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/2. Acesso em: 13 dec. 2025.