TY  - JOUR
AU  - A. Yu. Kolesov
AU  - Yu. S. Kolesov
TI  - Construction of the normal form in a neighborhood of a cycle by means of the Krylov--Bogolyubov--Mitropol'ski{\v\i} asymptotic method
JO  - Differencialʹnye uravneniâ
PY  - 1988
SP  - 891
EP  - 894
VL  - 24
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1988_24_5_a20/
LA  - ru
ID  - DE_1988_24_5_a20
ER  -