NATURAL FREQUENCIES OF RECTANGULAR PLATE WITH LINEARLY VARYING THICKNESS. Journal of Engineering, [S. l.], v. 9, n. 01, p. 9–23, 2003. DOI: 10.31026/j.eng.2003.01.14. Disponível em: https://joe.uobaghdad.edu.iq/index.php/main/article/view/2655.. Acesso em: 4 jul. 2024.