TY  - JOUR
AU  - I. D. Cherkasov
TI  - Equivalence groups of second order linear differential equations
JO  - Doklady Akademii Nauk
PY  - 1969
SP  - 50
EP  - 52
VL  - 187
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1969_187_1_a12/
LA  - ru
ID  - DAN_1969_187_1_a12
ER  -