WILLIAMS, M. Metric currents, differentiable structures, and Carnot groups. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 11, n. 2, p. 259-302, 2012. DOI: 10.2422/2036-2145.201007_003. Disponível em: http://20.103.181.36/index.php/annaliscienze/article/view/264. Acesso em: 29 may. 2025.