**International
Journal of Difference Equations (IJDE)**

**Volume
4, Number 1 June (2009)**

*CONTENTS*

**New Retarded Discrete Inequalities with Applications**

pp. 1-19

**Authors:**
*Ravi Agarwal, Young-Ho Kim and S. K. Sen *

**On the Asymptotic Behavior of a Nonautonomous Difference Equation**

pp. 21-26

**Authors:***
A. Aghajani and M. Ejtehadi*

**Stochastic Differential Equations and Inclusions with
Mean Derivatives relative to the Past**

pp. 27–41

**Authors:
***Svetlana V. Azarina and Yuri E. Gliklikh, *

**Symmetric Functions and Difference Equations with
Asymptotically Period-two Solutions**

pp. 43–48

**Authors:
***Kenneth S. Berenhaut and Richard T. Guy *

**Definiteness of quadratic functionals for Hamiltonian and symplectic systems: A survey**

pp. 49–67

**Authors:
***Simon Hilscher and Petr Zemanek *

**On Oscillation and Asymptotic Behaviour of a Higher
Order Functional Difference Equation of Neutral Type**

pp. 69-96

**Authors:***
Bas ak Karpuz, Radhanath Rath and Subhendu Kumar Rath*

**Unboundedness for some Classes of Rational Difference Equations**

pp. 97–113

**Authors:
***G. Lugo, F. J. Palladino *

**Two Modifications of the
Beverton–Holt Equation **

pp.
115–136

**Authors:
***G. Papaschinopoulos, C. J. Schinas and G. Stefanidou*

**A Study of the Dynamic Difference Approximations on Time Scales **

pp. 137–153

**Authors:
***Qin Sheng and Anzhong Wang *

**Stability and Hopf Bifurcation for a Discrete
Disease Spreading Model in Complex Networks**

pp. 155-163

**Author:***
Kejun Zhuang *