Title:  On stability of generic subriemannian caustic in the three-space 
 Authors:  A.A. Agrachev, G. Charlot, J.-P. A. Gauthier, V. M. Zakalyukin 
 Journal title:  C. R. Acad. Sci. Paris Sér. I Math. 
 Year:  2000 
 Issue:  6 
 Volume:  330 
 Pages:  465–470 

