DOROGOVTSEV, A. Ya. On One Case of Existence of Homogeneous Solutions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 2, p. 190–194, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4054. Acesso em: 5 dec. 2025.