TY  - JOUR
AU  - A. A. Dezin
TI  - Natural differential operators and the separation of variables
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 25
EP  - 31
VL  - 9
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_1_a3/
LA  - ru
ID  - DE_1973_9_1_a3
ER  -