1. Focal Boundary Value Problems for Differential and Difference Equations;Agarwal,1998
2. Positive Solutions of Differential, Difference, and Integral Equations;Agarwal,1999
3. Positive solutions and eigenvalues of conjugate boundary value problems;Agarwal;Proc. Edinburgh Math. Soc.,1999
4. Twin solutions to singular boundary value problems;Agarwal;Proc. Amer. Math. Soc.,2000
5. Green's function for an n-point discrete right focal boundary value problem;Anderson;Panamer. Math. J.,1998