TY  - JOUR
AU  - V. I. Matsaev
TI  - The existence of transformation operators for differential equations of higher order
JO  - Doklady Akademii Nauk
PY  - 1960
SP  - 499
EP  - 502
VL  - 130
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1960_130_3_a3/
LA  - ru
ID  - DAN_1960_130_3_a3
ER  -