Vittone, Davide. “Lipschitz Surfaces, Perimeter and Trace Theorems for BV Functions in Carnot-Carathéodory Spaces”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 11, no. 4 (December 19, 2012): 939-998. Accessed May 28, 2025. http://20.103.181.36/index.php/annaliscienze/article/view/288.