Local Solvability for a Class of Nonhomogeneous Left Invariant Differential Operators on HR \bigotimes Rk. Journal of Partial Differential Equations, [S. l.], v. 3, n. 2, p. 16–26, 1990. Disponível em: https://global-sci.com/index.php/jpde/article/view/3656. Acesso em: 5 dec. 2025.