TY  - JOUR
AU  - Yu. V. Churin
TI  - Closure of a set of systems with singular periodic solutions
JO  - Differencialʹnye uravneniâ
PY  - 1988
SP  - 999
EP  - 1004
VL  - 24
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1988_24_6_a9/
LA  - ru
ID  - DE_1988_24_6_a9
ER  -