Geodesic
The index of extremality and quasiextremal controls
Doklady Akademii Nauk, Tome 284 (1985) no. 4, pp. 777-781 
A. A. Agrachev; R. V. Gamkrelidze. The index of extremality and quasiextremal controls. Doklady Akademii Nauk, Tome 284 (1985) no. 4, pp. 777-781. http://geodesic.mathdoc.fr/item/DAN_1985_284_4_a0/
@article{DAN_1985_284_4_a0,
     author = {A. A. Agrachev and R. V. Gamkrelidze},
     title = {The index of extremality and quasiextremal controls},
     journal = {Doklady Akademii Nauk},
     pages = {777--781},
     year = {1985},
     volume = {284},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_284_4_a0/}
}
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