TY  - JOUR
AU  - K. S. Sibirskii
TI  - The problem of an algebraic integral in the case of the center
JO  - Differencialʹnye uravneniâ
PY  - 1972
SP  - 2211
EP  - 2214
VL  - 8
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1972_8_12_a12/
LA  - ru
ID  - DE_1972_8_12_a12
ER  -