TY  - JOUR
AU  - E. E. Barbashina
TI  - Necessary conditions of Copa--Moir type for a Goursat--Darboux system
JO  - Differencialʹnye uravneniâ
PY  - 1989
SP  - 1045
EP  - 1047
VL  - 25
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1989_25_6_a19/
LA  - ru
ID  - DE_1989_25_6_a19
ER  -