On Goursat and Dirichlet problems for a third order equation. Neliniini Kolyvannya, [S. l.], v. 11, n. 3, p. 305–315, 2008. Disponível em: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/482. Acesso em: 21 jan. 2026.