TY  - JOUR
AU  - S. N. Shimanov
AU  - N. I. Kazeeva
TI  - A fundamental theorem on critical cases of difference systems
JO  - Differencialʹnye uravneniâ
PY  - 1971
SP  - 910
EP  - 918
VL  - 7
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1971_7_5_a12/
LA  - ru
ID  - DE_1971_7_5_a12
ER  -