A.A. Agrachev, A "Gauss-Bonnet formula" for contact sub-Riemannian manifolds

Title: A "Gauss-Bonnet formula" for contact sub-Riemannian manifolds
Authors: A.A. Agrachev
Journal title: Russian Math. Dokl.
Year: 2001
Volume: 381
Pages: 583-585
File: Download