TY  - JOUR
AU  - P. T. Cherevichny
TI  - Three theorems on the Poincar\'e index for the equation $y'=P_4(x,y)/Q_4(x,y)$
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 778
EP  - 779
VL  - 9
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_4_a29/
LA  - ru
ID  - DE_1973_9_4_a29
ER  -