KHIEM, N. T.; HUNG, D. T.; NINH, V. T. A. Multiple crack identification in stepped beam by measurements of natural frequencies. Vietnam Journal of Mechanics, Hanoi, Vietnam, v. 36, n. 2, p. 119–132, 2014. DOI: 10.15625/0866-7136/36/2/3141. Disponível em: https://vjs.ac.vn/index.php/vjmech/article/view/3141. Acesso em: 30 jun. 2022.