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  url    = {http://www.amazon.com/Machine-Learning-Tom-M-Mitchell/dp/0070428077},

  const  = {\ text}
}
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  year   = {2008},
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  const  = {\ text}
}
@Inproceedings{DBLP:conf/esws/BoerSW06,
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  year   = {2006},
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  const  = {\ text}
}
@Inproceedings{DBLP:conf/esws/LeiSLZUM06,
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  year   = {2006},
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  const  = {\ text}
}
@Inproceedings{DBLP:conf/esws/WangLBCW06,
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  year   = {2006},
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  const  = {\ text}
}
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  journal = {Journal on Artificial Intelligence Research},
  year   = {2005},
  number = {},
  url    = {http://dblp.uni-trier.de/db/journals/jair/jair24.html#CimianoHS05},

  const  = {\ text}
}
@Inproceedings{tane04semantic,
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  year   = {2004},
  number = {},
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  const  = {\ text}
}