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3. Finding the solutions, satisfying a given condition at infinity, of some systems of ordinary differential equations, II;Birger;Zh. vȳchisl. Mat. mat. Fiz.,1966
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5. Numerical isolation of the solutions, convergent to zero at infinity, of some two-dimensional non-linear systems of ordinary differential equations;Konyukhova;Zh. vȳchisl. Mat. mat. Fiz.,1970