TY  - JOUR
AU  - E. E. Barbashina
TI  - Necessary conditions with matrix impulses for a Goursat--Darboux system
JO  - Differencialʹnye uravneniâ
PY  - 1990
SP  - 342
EP  - 343
VL  - 26
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1990_26_2_a19/
LA  - ru
ID  - DE_1990_26_2_a19
ER  -