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It was conjectured by Jackson et.al. that the finite volume effectivepartition function of QCD with the topological charge $M-N$ coincides with theItzyskon-Zuber type integral for $M\times N$ rectangular matrices. In thepresent article we give a proof of this conjecture, in which the originalItzykson-Zuber integral is utilized.Comment: 7pages, LaTeX2

Effective QCD Partition Function in Sectors with Non-Zero Topological Charge and Itzykson-Zuber Type Integral