Differ. Uravn., 1974 Volume 10, Number 11,Pages 1964–1987(Mi de2310)
Ordinary Differential Equations
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