1. Difference Equations and Inequalities;Agarwal,1992
2. Y. Zhou and B.G. Zhang, Oscillations of delay difference equations in a critical state, (submitted).
3. Oscillation criteria and comparison theorems for delay difference equations;Zhang;Fasciculi Mathematici,1995
4. Oscillation and nonoscillation for second-order linear differential equations;Huang;J. Math. Anal. Appl.,1997
5. Advanced Topics in Difference Equations;Agarwal,1997