AYALA, V´Ä±ctor; DINIZ, Marcos M.; LIMA, Jos´e C.P.; VELOSO, Jos´e M.M.; TRIBUZY, Ivan. Wave Front Sets Singularities of Homogeneous Sub-Riemannian Three Dimensional Manifolds. CUBO, A Mathematical Journal, [S. l.], v. 10, n. 2, p. 107–134, 2008. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1519. Acesso em: 13 oct. 2025.