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      Improvements that don't add up : ad-hoc retrieval results since 1998

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      Proceeding of the 18th ACM conference (CIKM '09)
      December 02, 2009 - December 06, 2009

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          Conference
          2009
          : 601
          Article
          10.1145/1645953.1646031
          0cb43018-9219-4183-9921-0e25585f5e1e
          © 2009
          Proceeding of the 18th ACM conference
          CIKM '09
          18
          Hong Kong, China
          December 02, 2009 - December 06, 2009
          SIGIR, ACM Special Interest Group on Information Retrieval
          SIGWEB, ACM Special Interest Group on Hypertext, Hypermedia, and Web
          History

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