Mattila, Pertti, Raul Serapioni, and Francesco Serra Cassano. “Characterizations of Intrinsic Rectifiability in Heisenberg Groups”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 9, no. 4 (December 15, 2010): 687-723. Accessed May 26, 2026. https://journals-dev.sns.it/index.php/annaliscienze/article/view/218.