Geodesic
Affine-invariant conditions for topological distinction of quadratic systems in the presence of a center
Differencialʹnye uravneniâ, Tome 19 (1983) no. 3, pp. 371-379.

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     author = {N. I. Vulpe},
     title = {Affine-invariant conditions for topological distinction of quadratic systems in the presence of a center},
     journal = {Differencialʹnye uravneni\^a},
     pages = {371--379},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_3_a0/}
}
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N. I. Vulpe. Affine-invariant conditions for topological distinction of quadratic systems in the presence of a center. Differencialʹnye uravneniâ, Tome 19 (1983) no. 3, pp. 371-379. http://geodesic.mathdoc.fr/item/DE_1983_19_3_a0/