Polar Coordinates for the Generalized Baouendi-Grushin Operator and Applications. Journal of Partial Differential Equations, [S. l.], v. 20, n. 4, p. 322–336, 2020. Disponível em: https://global-sci.com/index.php/jpde/article/view/4109. Acesso em: 5 dec. 2025.