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## Proyecciones (Antofagasta)

##
*Print version* ISSN 0716-0917

### Proyecciones (Antofagasta) vol.33 no.3 Antofagasta Sept. 2014

#### http://dx.doi.org/10.4067/S0716-09172014000300007

Proyecciones Journal of Mathematics Vol. 33, N^{o} 3, pp. 325-347, September 2014. Universidad Católica del Norte Antofagasta - Chile

**On the qualitative properties of differential equations of third order with retarded argument**

**Cemil Tunc **

*Yüzüncü Yil University*

* Turkey *

**Sizar Abid Mohammed **

*University of Duhok*

*Iraq *

**ABSTRACT**

*By using the standard Liapunov-Krasovskii functional approach, in this paper, new stability, boundedness and ultimately boundedness criteria are established for a class of vector functional differential equations of third order with retarded argument.*

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**Cemil Tunç**

Department of Mathematics

Faculty of Sciences

Yüzmicu Yil University

65080 Van

Turkey

e-mail : cemtunc@yahoo.com

**Sizar Abid Mohammed**

University of Duhok, Zakko Street 38

1006 AJ Duhok

Iraq

e-mail : sizar@uod.ac

Received : April 2014. Accepted : June 2014