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  url    = {http://doi.acm.org/10.1145/1480506.1480508},
  doi = {10.1145/1480506.1480508},
  const  = {\ text}
}
@Article{jarvelin2002cumulated,
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  const  = {\ text}
}
@Inproceedings{jarvelin2000ir,
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  year   = {2000},
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  const  = {\ text}
}
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  const  = {\ text}
}