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Discrete systems on infinite intervals
(Elsevier BV, 1998-05-01)
We study superlinear boundary value problems for a discrete system which in particular includes the prototype equation x(k + 1) = f(k,x(k)), equations with finite as well as infinite delays, equations of neutral type, and ...
A fixed-point approach for nonlinear discrete boundary value problems
(Elsevier BV, 1998-11-01)
Positive solutions to singular initial value problems with sign changing nonlinearities
(Elsevier BV, 1998-08-01)