DE ROSA, M. A.; LIPPIELLO, M. Natural vibration frequencies of tapered beams Engineering. Engineering Transactions, [S. l.], v. 57, n. 1, p. 45–66, 2014. Disponível em: https://et.ippt.pan.pl/index.php/et/article/view/183. Acesso em: 20 jul. 2025.