Dirichlet Eigenvalue Ratios for the p-sub-Laplacian in the Carnot Group. Journal of Partial Differential Equations, [S. l.], v. 22, n. 1, p. 1–10, 2009. Disponível em: https://global-sci.com/index.php/jpde/article/view/4130. Acesso em: 5 dec. 2025.