TY  - JOUR
AU  - Yu. F. Kalin
AU  - N. I. Vulpe
TI  - Affine-invariant conditions for the topological discrimination of quadratic Hamiltonian differential systems
JO  - Differencialʹnye uravneniâ
PY  - 1998
SP  - 298
EP  - 302
VL  - 34
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1998_34_3_a2/
LA  - ru
ID  - DE_1998_34_3_a2
ER  -