Positive solutions of differential, difference, and integral equations / by Ravi P. Agarwal, Donal O'Regan and Patricia J.Y. WongOscillation theory for difference and functional differential equations / by Ravi P. Agarwal, Said R. Grace and Donal O'ReganIntegral and integrodifferential equations : theory, methods and applications / ed. by Ravi P. Agarwal and Donal O'ReganInfinite interval problems for differential, difference and integral equations / by Ravi P. Agarwal and Donal O'ReganOscillation theory for second order linear, half-linear, superlinear and sublinear dynamic equations / by Ravi P. Agarwal, Said R. Grace and Donal O'ReganSingular differential and integral equations with applications / by Ravi P. Agarwal and Donal O'ReganNonlinear analysis and applications : to V. Lakshmikantham on his 80th birthday / ed. by Ravi P. Agarwal and Donal O'Regan