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References:
[1] Nelson J. L.: A stability theorem for a third order nonlinear differential equation. Pacific J. Math. 24 (1968), 341-344. MR 0223664 | Zbl 0155.13901
[2] Hartman Ph.: Ordinary differential equations. New-York, John Wiley, 1964. MR 0171038 | Zbl 0125.32102
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