  Motivated by the study of systems of higher order boundary value problems
with functional boundary conditions, we discuss, by topological methods, the
solvability of a fairly general class of systems of perturbed Hammerstein
integral equations, where the nonlinearities and the functionals involved
depend on some derivatives. We improve and complement earlier results in the
literature. We also provide some examples in order to illustrate the
applicability of the theoretical results.
