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This paper describes the participation of the Chemnitz University of Technology at Grid@CLEF 2009. We integrated the CIRCO framework into our Xtrieval framework and performed 15 runs in the three languages German, English, and French. For each language we used two different stemmers and two different retrieval models. One run one was a fusion run combining the results of the four other experiments. Whereas the different runs demonstrated that the impact of the used retrieval technologies isdblp:conf/clef/EiblK09 fatcat:scbrtgcoarfyrcuoboy3htknmi