On the application of the effective action approach to amplitudes with   reggeon splitting
  Application of the effective action approach to amplitudes with loop integration is studied for collisions on two and three centers with possible gluon emission. A rule is formulated for the integration around pole singularities in the induced vertices which brings the results in agreement with the QCD. It is demonstrated that the amplitudes can be restored from the purely transverse picture by introducing the standard Feynman propagators for intermediate gluons and quarks. 
M.A.Braun, S.S.Pozdnyakov, M.Yu.Salykin and M.I.Vyazovsky   (Saint-Petersburg State University, Russia)
hep-ph