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      Introduction
      User Relevance Feedback
         Query Expansion and Term Reweighting for the Vector Model
         Term Reweighting for the Probabilistic Model
         A Variant of Probabilistic Term Reweighting
         Evaluation of Relevance Feedback Strategies
Automatic Local Analysis
         Query Expansion Through Local Clustering
         Query Expansion Through Local Context Analysis
Automatic Global Analysis
         Query Expansion based on a Similarity Thesaurus
         Query Expansion based on a Statistical Thesaurus
Trends and Research Issues
      Bibliographic Discussion
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