@article{AIHPC_1996__13_6_635_0, author = {Agrachev, Andrei A. and Sarychev, A. V.}, title = {Abnormal sub-riemannian geodesics : Morse index and rigidity}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {13}, year = {1996}, pages = {635-690}, mrnumber = {1420493}, zbl = {0866.58023}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_1996__13_6_635_0} }
Agrachev, A. A.; Sarychev, A. V. Abnormal sub-riemannian geodesics : Morse index and rigidity. Annales de l'I.H.P. Analyse non linéaire, Tome 13 (1996) pp. 635-690. http://gdmltest.u-ga.fr/item/AIHPC_1996__13_6_635_0/
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