ZHAI, Haoting. Theoretical Research on Hopf Insulators and Model Construction in One-Dimensional Phononic Crystals. International Journal of Advanced Engineering and Technology Research, [S. l.], v. 1, n. 3, p. 49–54, 2026. DOI: 10.54097/xkrpq207. Disponível em: https://ijaetr.org/index.php/ojs/article/view/68. Acesso em: 23 apr. 2026.