Geodesic
The analytic and the qualilative theory, and also the asymptotic behavior of the solutions of the system $dx/dz=2$ $\surd P(x,\,y)/z$. $dy/dz=2$ $\surd P(x,\,y)/(1-z)$. II
Differencialʹnye uravneniâ, Tome 10 (1974) no. 11, pp. 1964-1987.

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     author = {N. P. Erugin},
     title = {The analytic and the qualilative theory, and also the asymptotic behavior of the solutions of the system $dx/dz=2$ $\surd P(x,\,y)/z$. $dy/dz=2$ $\surd P(x,\,y)/(1-z)$. {II}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1964--1987},
     publisher = {mathdoc},
     volume = {10},
     number = {11},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_11_a6/}
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N. P. Erugin. The analytic and the qualilative theory, and also the asymptotic behavior of the solutions of the system $dx/dz=2$ $\surd P(x,\,y)/z$. $dy/dz=2$ $\surd P(x,\,y)/(1-z)$. II. Differencialʹnye uravneniâ, Tome 10 (1974) no. 11, pp. 1964-1987. http://geodesic.mathdoc.fr/item/DE_1974_10_11_a6/