HAGEL, Marek. Method of calculating the acoustical wave reflection coefficient from a not-sharp boundary of two media. Archives of Acoustics, [S. l.], v. 11, n. 1, p. 25–38, 2015. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3106. Acesso em: 25 apr. 2025.