@misc{ Prequel,
  note = {available at http://www.cs.toronto.edu/~fbacchus/sat.html}
}
,
  url = {prequel.pdf}
}
,
  title = {QBF Preprocessor Prequel}
}
,
  year = {2006}
}
,
  author = {H. Samulowitz and J. Davies and F. Bacchus}
}