SISEN AHMED , M. Natural frequencies of RC concrete slab with opening. Academic Journal of Nawroz University, [S. l.], v. 13, n. 2, p. 603–613, 2024. DOI: 10.25007/ajnu.v13n2a1387. Disponível em: https://journals.nawroz.edu.krd/index.php/ajnu/article/view/1387. Acesso em: 16 jul. 2024.