# Information on the author

Donal O'Regan

- Existence theory for single and multiple periodic and almost periodic solutions of nonlinear integral equations
- R. P. Agarwal and D. O'Regan
- Volume 4, No.1, pp. 2-15
- Link
- Eigenvalue characterization of a system of difference equations
- R. P. Agarwal, D. O'Regan, and P. J. Y. Wong
- Volume 7, No.1, pp. 3-47
- Link PDF
- Existence of positive solutions for the singular equation
- H. Lü, D. O'Regan, and Cheng-Kui Zhong
- Volume 6, No.1, pp. 117-132
- Link PDF
- Fixed point theory for weakly sequentially upper semicontinuous maps with applications to differential inclusions
- R. P. Agarwal and D. O'Regan
- Volume 5, No.3, pp. 287-296
- Link PDF
- Optimal existence theory for single and multiple positive periodic solutions to functional differential equations
- D. Jiang, D. O'Regan, and R. P. Agarwal
- Volume 6, No.3, pp. 334-345
- Link PDF