YU, J.G.; ZHANG, B.; LEFEBVRE, J.E.; ZHANG, CH. Wave propagation in functionally graded piezoelectric rods with rectangular cross-section. Archives of Mechanics, Warsaw, Poland, v. 67, n. 3, p. 213–231, 2015. Disponível em: https://am.ippt.pan.pl/index.php/am/article/view/v67p213. Acesso em: 19 nov. 2025.