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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 $(\varphi_p(y^\prime))^\prime+g(t,y,y^\prime)=0$: 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