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References:
[1] W. J. Coles: Boundedness of solutions of two-dimensional first order differential systems. Bolletino U. M. I., S. IV, No 2 (225-231), 1971. MR 0293162 | Zbl 0229.34027
[2] P. Šoltés: On certain properties of the solutions of a non-linear differential equation of the second order. Arch. Math. 2, VII, 47-63, 1971. MR 0303012
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