VECCHI, E. Steiner Formula and Gaussian Curvature in the Heisenberg Group. Bruno Pini Mathematical Analysis Seminar, [S. l.], v. 7, n. 1, p. 97–115, 2016. DOI: 10.6092/issn.2240-2829/6693. Disponível em: https://mathematicalanalysis.unibo.it/article/view/6693. Acesso em: 28 apr. 2024.