%0 Journal Article
%A P. T. Cherevichny
%T The index of a singular point of the equation $y'=\frac{P_4(x,y)}{Q_4(x,y)}$
%J Differencialʹnye uravneniâ
%D 1977
%P 463-467
%V 13
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1977_13_3_a8/
%G ru
%F DE_1977_13_3_a8