1. Difference Equations and Applications: Theory, Methods and Applications;Agarwal,2000
2. Positive Solutions of Differential, Difference and Integral Equations;Agarwal,1999
3. Multiple positive solutions of singular and nonsingular discrete problems;Agarwal;Nonlinear Anal.,2004
4. Existence of positive solutions to singular semi-positone boundary value problems;Agarwal;Nonlinear Anal.,2002
5. Discrete Hamiltonian Systems: Difference Equations, Continued Fractions, and Riccati Equations;Ahlbrandt,1996