Geodesic
Generalized characteristic numbers of non-autonomous systems
Differencialʹnye uravneniâ, Tome 1 (1965) no. 9, pp. 1140-1148.

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     author = {Yu. S. Bogdanov},
     title = {Generalized characteristic numbers of non-autonomous systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1140--1148},
     publisher = {mathdoc},
     volume = {1},
     number = {9},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_9_a1/}
}
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Yu. S. Bogdanov. Generalized characteristic numbers of non-autonomous systems. Differencialʹnye uravneniâ, Tome 1 (1965) no. 9, pp. 1140-1148. http://geodesic.mathdoc.fr/item/DE_1965_1_9_a1/