%0 Journal Article %A I. U. Bronshtein %A I. V. Nikolaev %T Orbital normal forms and bifurcations of fields of linear elements in the plane %J Differencialʹnye uravneniâ %D 1995 %P 934-938 %V 31 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1995_31_6_a1/ %G ru %F DE_1995_31_6_a1