TY  - JOUR
AU  - R.I. Bogdanov
TI  - Singularities of Vector Fields on the Plane With Pointed Direction.
JO  - Inventiones mathematicae
PY  - 1979
SP  - 247
EP  - 260
VL  - 54
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1979__54_142681/
ID  - IM_1979__54_142681
ER  -