TY  - JOUR
AU  - S. P. Khekalo
TI  - Stepwise Gauge Equivalence of Differential Operators
JO  - Matematičeskie zametki
PY  - 2005
SP  - 917
EP  - 929
VL  - 77
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_2005_77_6_a9/
LA  - ru
ID  - MZM_2005_77_6_a9
ER  -