TY  - JOUR
AU  - N. I. Vulpe
TI  - Minimal complete system of orthogonal invariants of a two-dimensional differential system
JO  - Differencialʹnye uravneniâ
PY  - 1983
SP  - 564
EP  - 569
VL  - 19
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1983_19_4_a1/
LA  - ru
ID  - DE_1983_19_4_a1
ER  -