TY  - JOUR
AU  - V. A. Yakubovich
TI  - Frequency criteria for invariance up to $\varepsilon$ of control systems with one nonlinear block
JO  - Doklady Akademii Nauk
PY  - 1978
SP  - 283
EP  - 286
VL  - 240
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1978_240_2_a9/
LA  - ru
ID  - DAN_1978_240_2_a9
ER  -