APAKOV, Yu. P. Boundary-Value Problem for a Degenerate High-Odd-Order Equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 66, n. 10, p. 1318–1331, 2014. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2224. Acesso em: 5 dec. 2025.