TY  - JOUR
AU  - N. V. Stepanov
TI  - The geometry of two second-order ordinary differential equations
JO  - Doklady Akademii Nauk
PY  - 1961
SP  - 62
EP  - 65
VL  - 140
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1961_140_1_a15/
LA  - ru
ID  - DAN_1961_140_1_a15
ER  -