TY  - JOUR
AU  - O. A. Ivanov
AU  - G. R. Kudryashova
TI  - On the smoothness of an invariant surface of a quasihomogeneous system in the neighborhood of a simple exceptional direction
JO  - Differencialʹnye uravneniâ
PY  - 1987
SP  - 540
EP  - 543
VL  - 23
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1987_23_3_a31/
LA  - ru
ID  - DE_1987_23_3_a31
ER  -