Three theorems on the Poincaré index for the equation $y'=P_4(x,y)/Q_4(x,y)$
Differencialʹnye uravneniâ, Tome 9 (1973) no. 4, pp. 778-779
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@article{DE_1973_9_4_a29,
author = {P. T. Cherevichny},
title = {Three theorems on the {Poincar\'e} index for the equation $y'=P_4(x,y)/Q_4(x,y)$},
journal = {Differencialʹnye uravneni\^a},
pages = {778--779},
year = {1973},
volume = {9},
number = {4},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/DE_1973_9_4_a29/}
}
P. T. Cherevichny. Three theorems on the Poincaré index for the equation $y'=P_4(x,y)/Q_4(x,y)$. Differencialʹnye uravneniâ, Tome 9 (1973) no. 4, pp. 778-779. http://geodesic.mathdoc.fr/item/DE_1973_9_4_a29/