TY  - JOUR
AU  - S. M. Vishik
TI  - On invariant characteristics of quadratically nonlinear systems of cascade type
JO  - Doklady Akademii Nauk
PY  - 1976
SP  - 1269
EP  - 1272
VL  - 228
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1976_228_6_a1/
LA  - ru
ID  - DAN_1976_228_6_a1
ER  -