TY  - JOUR
AU  - N. I. Vulpe
AU  - K. S. Sibirskii
TI  - Geometric classification of a quadratic differential system
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 803
EP  - 814
VL  - 13
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_5_a1/
LA  - ru
ID  - DE_1977_13_5_a1
ER  -