“…However, it is clear that before a non-perturbative information can be reliably extracted from experimental data, all perturbative aspects, such as QCD evolution, have to be understood. So far, the main effort has been devoted to studies of evolution equations for skewed parton distributions in the momentum representation [1,2,5,12,13,14,15,16,17,18]. This is certainly the most natural choice in the forward, deep inelastic scattering limit, but, as observed recently [19], as soon as there is a longitudinal momentum transfer between initial and final hadron states, the corresponding amplitude can be as conveniently represented in terms of momentum-as coordinate-space skewed parton distributions.…”