@inproceedings{ preQ06,
  publisher = {<undefined>}
}
,
  title = {Preprocessing QBF}
}
,
  url = {SBCP2006.pdf}
}
,
  booktitle = {Principles and Practice of Constraint Programming}
}
,
  author = {H. Samulowitz and J. Davies and F. Bacchus}
}
,
  year = {2006}
}