TY  - JOUR
AU  - Kh. Zholondek
TI  - On the versality of a family of symmetric vector fields in the plane
JO  - Sbornik. Mathematics
PY  - 1984
SP  - 463
EP  - 492
VL  - 48
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/SM_1984_48_2_a11/
LA  - en
ID  - SM_1984_48_2_a11
ER  -