Geodesic
On unstable neutral differential equations of the second order
Czechoslovak Mathematical Journal, Tome 52 (2002) no. 4, pp. 739-747.

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The aim of this paper is to present sufficient conditions for all bounded solutions of the second order neutral differential equation \[ \big (x(t)-px(t-\tau )\big )^{\prime \prime }- q(t)x\big (\sigma (t)\big )=0 \] to be oscillatory and to improve some existing results. The main results are based on the comparison principles.
Classification : 34C10, 34K11, 34K20, 34K40
Keywords: neutral equation; delayed argument 
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     title = {On unstable neutral differential equations of the second order},
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     pages = {739--747},
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Džurina, Jozef. On unstable neutral differential equations of the second order. Czechoslovak Mathematical Journal, Tome 52 (2002) no. 4, pp. 739-747. http://geodesic.mathdoc.fr/item/CMJ_2002__52_4_a6/