TY  - JOUR
AU  - Yu. N. Bibikov
TI  - The reducibility of a system of two differential equations to normal form
JO  - Differencialʹnye uravneniâ
PY  - 1971
SP  - 1899
EP  - 1902
VL  - 7
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1971_7_10_a16/
LA  - ru
ID  - DE_1971_7_10_a16
ER  -