Geodesic
A theorem on the index of differential systems and the geometry of
Doklady Akademii Nauk, Tome 281 (1985) no. 3, pp. 521-525 
V. A. Ginzburg. A theorem on the index of differential systems and the geometry of. Doklady Akademii Nauk, Tome 281 (1985) no. 3, pp. 521-525. http://geodesic.mathdoc.fr/item/DAN_1985_281_3_a0/
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     author = {V. A. Ginzburg},
     title = {A theorem on the index of differential systems and the geometry of},
     journal = {Doklady Akademii Nauk},
     pages = {521--525},
     year = {1985},
     volume = {281},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_281_3_a0/}
}
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