On the periodic solutions for an nth-order difference equations. - H. El-Owaidy; H. Y. Mohamed (Appl. Math. Comput., 2002)

Linearized oscillation for non-linear systems of delay differential equations. - H. El-Owaidy; H. Y. Mohamed (Appl. Math. Comput., 2003)

On the global attractivity of systems of nonlinear difference equations. - H. El-Owaidy; H. Y. Mohamed (Appl. Math. Comput., 2003)

The necessary and sufficient conditions of existence of periodic solutions of nonautonomous difference equations. - H. El-Owaidy; H. Y. Mohamed (Appl. Math. Comput., 2003)

Erratum to "On the periodic solutions for an nth order difference equations" [Appl. Math. Comput. 135(2003) 383-390]. - H. El-Owaidy; H. Y. Mohamed (Appl. Math. Comput., 2008)