%0 Journal Article %A N. P. Erugin %T Analytic and qualitative theory, and also asymptotic behavior of the solutions of the system of equations $\frac{dx}{dz}=\frac1{z}\sqrt{xy(x+y)}$, $\frac{dy}{dz}=\frac1{1-z}\sqrt{xy(x+y)}$ %J Differencialʹnye uravneniâ %D 1974 %P 379-408 %V 10 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1974_10_3_a0/ %G ru %F DE_1974_10_3_a0