GUDRA, T. Analysis of a resonator with a directional ultrasonic vibration converter of R-L type using the finite elements method. Archives of Acoustics, [S. l.], v. 25, n. 2, 2000. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/361. Acesso em: 13 jan. 2025.