LI, Ming; LI, Xinfu. Decay estimates for a kind of linear wave equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 7, p. 1001-, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1754. Acesso em: 5 dec. 2025.