ANH, L. T. N.; NINH, V. T. A.; LANG, T. V.; KIEN, N. D. Free vibration of bidirectional functionally graded sandwich beams using a first-order shear deformation finite element formulation. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, [S. l.], v. 14, n. 3, p. 136–150, 2020. DOI: 10.31814/stce.nuce2020-14(3)-12. Disponível em: https://stce.vjst.net/index.php/en/article/view/1746. Acesso em: 18 sep. 2026.