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neutral differential equations; nonoscillation; oscillation; positive and negative coefficients

References:

[1] D. D. Bainov D. P. Mishev: **Oscillation Theory for Neutral Differential Equations with Delay**. Adam Hilger, Philadelphia, 1991. MR 1147908

[2] Q. Chuanxi G. Ladas: **Linearized oscillation for equations with positive, negative coefficients**. Hiroshima Math. J. 20 (1990), 331-340. DOI 10.32917/hmj/1206129182 | MR 1063367

[3] L. H. Erbe Q. Kong B. G. Zhang: **Oscillation Theory for Functional Differential Equations**. Marcel Dekker, New York, 1994. MR 1309905

[4] I. Györi G. Ladas: **Oscillation Theory of Delay Differential Equations with Applications**. Clarendon Press, Oxford, 1991. MR 1168471

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[7] B. S. Lalli B. G. Zhang: **Oscillation of first order neutral differential equations**. Appl. Anal. 39 (1990), 265-274. DOI 10.1080/00036819008839986 | MR 1095638

[8] Yu Jianshe, Wang Zhicheng: **Some further results on oscillation of neutral differential equations**. Bull. Austral. Math. Soc. 46 (1992), 147-154. MR 1170449 | Zbl 0729.34051

[9] Yu Jianshe: **On the neutral delay differentia! equation with positive, negative coefficients**. Acta. Math. Sinica 34 (1991), 517-523. MR 1152147

[10] B. G. Zhang J. S. Yu: **The existence of positive solutions of neutral differential equations**. Scientia Sinica 8 (1992), 785-790.