KHANH, T. D. Second gradient substitution model for high contrast bi-phase structure. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, [S. l.], v. 14, n. 2, p. 116–126, 2020. DOI: 10.31814/stce.nuce2020-14(2)-11. Disponível em: https://stce.vjst.net/index.php/en/article/view/1619. Acesso em: 18 sep. 2026.