QED(1+1) on the Light Front and its implications for   semiphenomenological methods in QCD(3+1)
  A possibility of semiphenomenological description of vacuum effects in QCD quantized on the Light Front (LF) is discussed. A modification of the canonical LF Hamiltonian for QCD is proposed, basing on the detailed study of the exact description of vacuum condensate in QED(1+1) that uses correct form of LF Hamiltonian. 
V.A. Franke, S.A. Paston, E.V. Prokhvatilov