Mitropolsky Yu. А.; Кulchіtskу V. L. On asymptotic integration of a partial differential non-linear mixed boundary value problem . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 4, p. 540–544, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8590. Acesso em: 5 dec. 2025.