TY  - JOUR
AU  - N. H. Ibragimov
TI  - On the group classification of second order differential equations
JO  - Doklady Akademii Nauk
PY  - 1968
SP  - 274
EP  - 277
VL  - 183
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1968_183_2_a6/
LA  - ru
ID  - DAN_1968_183_2_a6
ER  -