TY  - JOUR
AU  - E. V. Ferapontov
TI  - Reciprocal transformations and their invariants
JO  - Differencialʹnye uravneniâ
PY  - 1989
SP  - 1256
EP  - 1265
VL  - 25
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1989_25_7_a21/
LA  - ru
ID  - DE_1989_25_7_a21
ER  -