TY  - JOUR
AU  - V. A. Lunkevich
AU  - K. S. Sibirskii
TI  - Quadratic zero-systems of differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1989
SP  - 1056
EP  - 1058
VL  - 25
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1989_25_6_a24/
LA  - ru
ID  - DE_1989_25_6_a24
ER  -