ELEEV, V. A.; KUMYKOVA, S. K. On some boundary-value problems with a shift on characteristics for a mixed equation of hyperbolic-parabolic type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 5, p. 707–716, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4464. Acesso em: 7 apr. 2025.