MEISSNER, Mirosław. Effect of cross-sectional area discontinuities in closed hard-walled ducts on frequency of longitudinal modes. Archives of Acoustics, [S. l.], v. 35, n. 3, p. 421–435, 2013. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/234. Acesso em: 26 apr. 2025.