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References:
[1] Futák Ј.: Über die Beschränktheit und die Existenz der Lösungen der Differentialgleichung 4. Ordnung mit nacheilendem Argument. Acta Univ. Palac. Olomucensis, Fac. R. Nat. (to apper).
[2] Futák Ј.: An existence and boundedness of solutions of a nonlinear differential equation of the n-th order with delay. Práce a štúdie VŠD, č. 3, (to appear).
[3] Futák Ј.: On the existence of solutions of the n-th order nonlinear differential equation with delay. Časopis pro pěs. mat. (to appear).
[4] Hallam T. G.: Asymptotic relationships between the solutions of two second order dìfferential equations. Annal. Polonici Math., 24, 1971, p. 295-300. MR 0301316 | Zbl 0217.40103
[5] Marušiak P.: Differenciaľnoje uravnenije s zapazdyvajusčim argumentom, asimptotičeski ekvivalentnoje s uravnenijem $y^{(n) }= 0$. Mat. časop. 23, 1973, No. L, p. 45-54. MR 0346284
[6] Norkin S. B.: Diferenciaľnyje uravnenija vtorovo porjadka s zapazdyvajuščim argumentom. Moskva 1965.
[7] Ráb M.: Bounds for solutions of the equation $[p(t)x']' + q(t)x = h(t, x, x')$. Arch. Math. 2. 9, 1975, p. 79-84. MR 0412520
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