Geodesic
On oscillation criteria for third order nonlinear delay differential equations
Archivum mathematicum, Tome 45 (2009) no. 1, pp. 1-18.

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In this paper we are concerned with the oscillation of third order nonlinear delay differential equations of the form \[ \ \left( r_{2}\left( t\right) \left( r_{1}\left( t\right) x^{\prime }\right) ^{\prime }\right) ^{\prime }+p\left( t\right) x^{\prime }+q\left( t\right) f\left( x\left( g\left( t\right) \right) \right) =0. \] We establish some new sufficient conditions which insure that every solution of this equation either oscillates or converges to zero.
Classification : 34C10, 34K11
Keywords: oscillation; third order; functional differential equation 
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     title = {On oscillation criteria for third order nonlinear delay differential equations},
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Agarwal, Ravi P.; Aktas, Mustafa F.; Tiryaki, A. On oscillation criteria for third order nonlinear delay differential equations. Archivum mathematicum, Tome 45 (2009) no. 1, pp. 1-18. http://geodesic.mathdoc.fr/item/ARM_2009__45_1_a0/