KHOMA, S. G. Solution of one boundary-value problem for a hyperbolic equation of the second order. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 4, p. 572–573, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4449. Acesso em: 5 dec. 2025.