The index of a singular point of the equation $y'=\frac{P_4(x,y)}{Q_4(x,y)}$
Differencialʹnye uravneniâ, Tome 13 (1977) no. 3, pp. 463-467.

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     author = {P. T. Cherevichny},
     title = {The index of a singular point of the equation $y'=\frac{P_4(x,y)}{Q_4(x,y)}$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {463--467},
     publisher = {mathdoc},
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     year = {1977},
     language = {ru},
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P. T. Cherevichny. The index of a singular point of the equation $y'=\frac{P_4(x,y)}{Q_4(x,y)}$. Differencialʹnye uravneniâ, Tome 13 (1977) no. 3, pp. 463-467. http://geodesic.mathdoc.fr/item/DE_1977_13_3_a8/