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We propose a new single superfield representation for mixed retarded andadvanced correlators for noninteracting disordered systems. The method istested in the simpler context of Random Matrix theory, by comparing with wellknown universal behavior for level spacing correlations. Our method is generaland could be especially interesting to study localization properties encoded inthe mixed correlators of Quantum Hall systems.Comment: 13 pages including two figures, RevTex4. Improved version. Figures  changed. To appear in Journal of Physics

Single superfield representation for mixed retarded and advanced correlators in disordered systems