MATEJA, O. Drgania swobodne pasma płytowego o zmiennej grubości. Engineering Transactions, [S. l.], v. 16, n. 4, p. 576–586, 1968. Disponível em: https://et3.ippt.pan.pl/index.php/et/article/view/2666. Acesso em: 10 jun. 2025.