TY  - JOUR
AU  - P. G. Grinevich
TI  - Vector rank of commuting matrix differential operators. Proof of S.\,P.~Novikov's criterion
JO  - Izvestiya. Mathematics 
PY  - 1987
SP  - 445
EP  - 465
VL  - 28
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1987_28_3_a1/
LA  - en
ID  - IM2_1987_28_3_a1
ER  -