Regularity Theorems for Elliptic and Hypoelliptic Operators Via the Global Relation. Journal of Partial Differential Equations, [S. l.], v. 24, n. 1, p. 83–96, 2018. DOI: 10.4208/jpde.v24.n1.6. Disponível em: https://global-sci.com/index.php/jpde/article/view/4182. Acesso em: 5 dec. 2025.