KHALID ABDILRAZZAQ, T. The effect of circular holes on the natural frequencies of a beam using transverse vibration measurements method _ENG. Al-Rafidain Engineering Journal (AREJ), [S. l.], v. 21, n. 2, p. 13–24, 2013. DOI: 10.33899/rengj.2013.72817. Disponível em: https://jamh.uomosul.edu.iq/index.php/arej/article/view/31473. Acesso em: 7 sep. 2025.