%0 Journal Article
%A Yu. F. Kalin
%A N. I. Vulpe
%T Affine-invariant conditions for the topological discrimination of quadratic Hamiltonian differential systems
%J Differencialʹnye uravneniâ
%D 1998
%P 298-302
%V 34
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1998_34_3_a2/
%G ru
%F DE_1998_34_3_a2