%0 Journal Article
%A P. T. Cherevichny
%T Three theorems on the Poincar\'e index for the equation $y'=P_4(x,y)/Q_4(x,y)$
%J Differencialʹnye uravneniâ
%D 1973
%P 778-779
%V 9
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1973_9_4_a29/
%G ru
%F DE_1973_9_4_a29