DVORNYK, A. V.; TKACHENKO, V. I. Almost periodic solutions of damping wave equation with impulsive action . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 75, n. 1, p. 62–71, 2023. DOI: 10.37863/umzh.v75i1.7400. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7400. Acesso em: 5 dec. 2025.