@article{DE_1995_31_6_a1,
     author = {I. U. Bronshtein and I. V. Nikolaev},
     title = {Orbital normal forms and bifurcations of fields of linear elements in the plane},
     journal = {Differencialʹnye uravneni\^a},
     pages = {934--938},
     publisher = {mathdoc},
     volume = {31},
     number = {6},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_6_a1/}
}