Perturbative Estimates of the Eigenfunctions of the Non-forward BFKL   Kernel
  We discuss, within the context of first order perturbation theory, the correction to the NLO BFKL wavefuncyion for scattering processes with non-zero momentum transfer, arising from the fact that in NLO the kernel is not covariant under conformal transformations. 
D. A. Ross