Comparison of different non-linear equations and corresponding   unitarization schemes
  Different forms of non-linear equations which mimic parton saturation in the non-perturbative regime are examined. These equations lead to corresponding unitarization schemes in the impact parameter representation of the hadron scattering amplitude. It is shown how specific properties of the non-linear equations reflect different features of the diffraction processes. 
O.V. Selyugin and J.-R. Cudell