Single Superfield Representation for Mixed Retarded and Advanced   Correlators in Disordered Systems
  We propose a new single superfield representation for mixed retarded and advanced correlators for noninteracting disordered systems. The method is tested in the simpler context of Random Matrix theory, by comparing with well known universal behavior for level spacing correlations. Our method is general and could be especially interesting to study localization properties encoded in the mixed correlators of Quantum Hall systems. 
Daniel G. Barci and Luis E. Oxman