TY  - JOUR
AU  - Yu. S. Bogdanov
TI  - Estimates of generalized characteristic numbers of differential systems
JO  - Differencialʹnye uravneniâ
PY  - 1966
SP  - 927
EP  - 933
VL  - 2
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1966_2_7_a6/
LA  - ru
ID  - DE_1966_2_7_a6
ER  -