DANICKI, Eugeniusz J. An approximation to the planar harmonic impedance for interface waves in piezoelectric body. Archives of Acoustics, [S. l.], v. 34, n. 2, p. 189–196, 2009. Disponível em: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/575. Acesso em: 29 apr. 2025.