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English version

**A. T. Ademola**

Department of Mathematics

University of Ibadan,

Ibadan, Nigeria

**P. O. Arawomo**

Department of Mathematics

University of Ibadan,

Ibadan, Nigeria

**O. M. Ogunlaran**

Department of Mathematics and Statistics

Bowen University, Iwo,

Osun State, Nigeria

**E. A. Oyekan**

Department of Mathematics and Statistics

Bowen University, Iwo,

Osun State, Nigeria

In this paper sufficient conditions for uniform asymptotic stability of the trivial solutions, uniform boundedness, uniform ultimate boundedness and asymptotic behaviour of solutions of some third order nonlinear neutral delay differential equations are established. We employ Lyapunov's direct method by constructing a complete Lyapunov functional to obtain the results. Recent results on third order nonlinear delay differential equations are particular cases of our results.

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