Correctness of a Dirichlet problem for degenerating many-dimensional equation of mixed type. Neliniini Kolyvannya, [S. l.], v. 20, n. 1, p. 20–31, 2017. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/852. Acesso em: 21 jan. 2026.