@Inproceedings{marchiori:1999:AFGAHP,
  author = {Elena Marchiori and Claudio Rossi},
  title  = {A Flipping Genetic Algorithm for Hard 3-SAT Problems},

  year   = {1999},
  number = {},
  url    = {http://www.cs.vu.nl/~elena/ga-858.ps.gz},

  const  = {\ text}
}
@Article{Rossi2004,
  author = {Stefano Rossi and Paolo F. Volpin},
  title  = {Cross-country determinants of mergers and acquisitions},
  journal = {Journal of Financial Economics},
  year   = {2004},
  number = {2},
  url    = {http://www.sciencedirect.com/science/article/B6VBX-4CCFBFS-1/1/42b2505b744b2afe7a82cf5d1e9f5603},

  const  = {\ text}
}