@article{SM_2020_211_10_a2,
     author = {N. B. Medvedeva},
     title = {The problem of distinguishing between a~centre and a~focus in the space of vector fields with given {Newton} diagram},
     journal = {Sbornik. Mathematics},
     pages = {1399--1446},
     publisher = {mathdoc},
     volume = {211},
     number = {10},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2020_211_10_a2/}
}