A. C. C. Barbosa, R. R. F. Pinto, and J. L. Jr., “Influence of plastic deformation over the natural frequency of steel structures”, ijaers, vol. 7, no. 4, Apr. 2020, Accessed: Jul. 22, 2024. [Online]. Available: https://journal-repository.com/index.php/ijaers/article/view/1826