TY  - JOUR
AU  - A. V. Megretski
TI  - Frequency criteria for the existence of periodic solutions for systems with integral constraints
JO  - Differencialʹnye uravneniâ
PY  - 1990
SP  - 594
EP  - 599
VL  - 26
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1990_26_4_a5/
LA  - ru
ID  - DE_1990_26_4_a5
ER  -