@article{AA_2001_13_2_a4,
     author = {N. B. Medvedeva},
     title = {Monodromy criterion for a~singular point of a~plane vector field},
     journal = {Algebra i analiz},
     pages = {130--150},
     year = {2001},
     volume = {13},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2001_13_2_a4/}
}