Title: Generic singularities of sub-Riemannian metrics on $$R3$$

Authors: A.A. Agrachev, El Alaoui El-Houcine Chakir, Gauthier Jean-Paul, I. Kupka

Journal title: C. R. Acad. Sci. Paris Sér. I Math.

Year: 1996

Issue: 4

Volume: 322

Pages: 377–384