Morse and Maslov indices for the extremals of controllable
Doklady Akademii Nauk, Tome 287 (1986) no. 3, pp. 521-524.

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@article{DAN_1986_287_3_a0,
     author = {A. A. Agrachev and R. V. Gamkrelidze},
     title = {Morse and {Maslov} indices for the extremals of controllable},
     journal = {Doklady Akademii Nauk},
     pages = {521--524},
     publisher = {mathdoc},
     volume = {287},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_287_3_a0/}
}
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A. A. Agrachev; R. V. Gamkrelidze. Morse and Maslov indices for the extremals of controllable. Doklady Akademii Nauk, Tome 287 (1986) no. 3, pp. 521-524. http://geodesic.mathdoc.fr/item/DAN_1986_287_3_a0/