HUNG, T. Q.; TU, T. M.; DUC, D. M. Free vibration of piezoelectric FGM sandwich beam with porous core embedded in thermal environment and elastic foundation. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, [S. l.], v. 15, n. 4, p. 15–28, 2021. DOI: 10.31814/stce.huce(nuce)2021-15(4)-02. Disponível em: https://stce.vjst.net/index.php/en/article/view/2068. Acesso em: 18 sep. 2026.