HOCHMUTH, R. An inhomogeneous Dirichlet problem for a non-hypoelliptic linear partial differential operator. Annales Fennici Mathematici, [S. l.], v. 21, n. 1, p. 179–187, 1996. Disponível em: https://afm.journal.fi/article/view/134861. Acesso em: 14 apr. 2025.