@inproceedings{ Lakemeyer99,
  ps = {http://www.cs.toronto.edu/cogrobo/Papers/query.ps}
}
,
  author = {Lakemeyer, G. and Levesque, H.}
}
,
  url = {query.pdf}
}
,
  booktitle = {Proc. IJCAI-99}
}
,
  title = {Query evaluation and progression in AOL knowledge bases}
}
,
  key = {CogRobo}
}
,
  year = {1999}
}
,
  opturl = {http://www.cs.toronto.edu/cogrobo/Papers/query.ps.gz}
}
,
  pdf = {http://www.cs.toronto.edu/cogrobo/Papers/query.pdf}
}
,
  pages = {}
}