APAKOV, Yu. P. On the solution of a boundary-value problem for a third-order equation with multiple characteristics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 1, p. 3–13, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2551. Acesso em: 5 dec. 2025.