RDZANEK, W. P. Jr.; ENGEL, Z. Directional characteristics of a planar annular plate for axially-symmetric free vibrations. Archives of Acoustics, [S. l.], v. 25, n. 1, p. 73–81, 2000. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/354. Acesso em: 25 apr. 2025.