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: https://journals.sns.it/index.php/annaliscienze/article/view/264. Acesso em: 20 feb. 2026.