@article{DE_1970_6_7_a22,
     author = {P. T. Cherevichny},
     title = {Formulae for the computation of the index of a singular point of the equation $y'=\frac{P_3(x,y)}{Q_3(x,y)}$ in terms 
},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1318--1319},
     publisher = {mathdoc},
     volume = {6},
     number = {7},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_7_a22/}
}