Geodesic
Analytic and qualitative theory, and also asymptotic behavior of the solutions of the system of equations $\frac{dx}{dz}=\frac1{z}\sqrt{xy(x+y)}$, $\frac{dy}{dz}=\frac1{1-z}\sqrt{xy(x+y)}$
Differencialʹnye uravneniâ, Tome 10 (1974) no. 3, pp. 379-408.

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     author = {N. P. Erugin},
     title = {Analytic and qualitative theory, and also asymptotic behavior of the solutions of the system of equations $\frac{dx}{dz}=\frac1{z}\sqrt{xy(x+y)}$, $\frac{dy}{dz}=\frac1{1-z}\sqrt{xy(x+y)}$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {379--408},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_3_a0/}
}
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N. P. Erugin. Analytic and qualitative theory, and also asymptotic behavior of the solutions of the system of equations $\frac{dx}{dz}=\frac1{z}\sqrt{xy(x+y)}$, $\frac{dy}{dz}=\frac1{1-z}\sqrt{xy(x+y)}$. Differencialʹnye uravneniâ, Tome 10 (1974) no. 3, pp. 379-408. http://geodesic.mathdoc.fr/item/DE_1974_10_3_a0/