ARCOZZI, N.; FERRARI, F.; MONTEFALCONE, F. Regularity of the distance function to smooth hypersurfaces in some two-step Carnot groups. Annales Fennici Mathematici, [S. l.], v. 42, n. 1, p. 339–356, 2017. DOI: 10.5186/aasfm.2017.4222. Disponível em: https://afm.journal.fi/article/view/135665. Acesso em: 26 nov. 2024.