TY  - JOUR
AU  - M. B. Sheftel
TI  - Group analysis of defining equations~-- a method for finding recursion operators
JO  - Differencialʹnye uravneniâ
PY  - 1994
SP  - 444
EP  - 456
VL  - 30
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1994_30_3_a11/
LA  - ru
ID  - DE_1994_30_3_a11
ER  -