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delay; differential inequality; oscillation

References:

[1] Ladde G.S., Lakshmikantham V., Zhang B.G.: **Oscillation Theory of Differential Equations with Deviating Arguments**. Marcel Dekker, New York, 1987. MR 1017244 | Zbl 0832.34071

[2] Kozakiewicz E.: **Oscillations for First Order Neutral Differential Equations**. ZAMM 73 (1993), T813-T815. MR 1237876 | Zbl 0815.34062

[3] Kozakiewicz E.: **Conditions for the absence of positive solutions of first order differential inequalities with deviating arguments**. 4th. Int. Coll. on Differential Equations, pp. 157-161, D. Bainov and V. Covachev (eds.), VSP 1994. MR 1458394 | Zbl 0843.34071

[4] Elbert Á., Stavroulakis I.P.: **Oscillation and Non-oscillation Criteria for Delay Differential Equations**. Proc. Amer. Math. Soc., 123 (1995), 1503-1510, or University of Ioannina, Greece, Technical Report No. 228, July 1993. MR 1242082