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@article{IM_1979__54_142681, author = {R.I. Bogdanov}, title = {Singularities of {Vector} {Fields} on the {Plane} {With} {Pointed} {Direction.}}, journal = {Inventiones mathematicae}, pages = {247--260}, publisher = {mathdoc}, volume = {54}, year = {1979}, zbl = {0423.58011}, url = {http://geodesic.mathdoc.fr/item/IM_1979__54_142681/} }
R.I. Bogdanov. Singularities of Vector Fields on the Plane With Pointed Direction.. Inventiones mathematicae, Tome 54 (1979), pp. 247-260. http://geodesic.mathdoc.fr/item/IM_1979__54_142681/