GROMYK, A. P.; KONET, I. M.; PYLYPIUK, T. M. Hyperbolic boundary-value problem for a piecewisehomogeneous hollow cylinder. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 12, p. 1607–1617, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/714. Acesso em: 7 apr. 2025.