@article{FAA_1978_12_3_a10,
     author = {R. I. Bogdanov},
     title = {Degree of degeneracy of a singular point of a vector field on the plane},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {70--71},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1978_12_3_a10/}
}