Title: Generic singularities of sub-Riemannian metrics on
![R3](http://control.botik.ru/wp-content/plugins/latex/cache/tex_5c108ce0fe89d0632cfce75f650b36c2.gif)
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