ZAMORSKI, Tomasz. The blurred cut-off frequency of acoustic horns. Archives of Acoustics, [S. l.], v. 6, n. 2, p. 135–146, 2016. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3302. Acesso em: 29 apr. 2025.