TY  - JOUR
AU  - Yu. S. Bogdanov
TI  - Generalized characteristic numbers of non-autonomous systems
JO  - Differencialʹnye uravneniâ
PY  - 1965
SP  - 1140
EP  - 1148
VL  - 1
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1965_1_9_a1/
LA  - ru
ID  - DE_1965_1_9_a1
ER  -