@article{Achdou:20061O,
  author = "Achdou, Yves  and  Pironneau, Olivier",
  title = "{American Options. Pricing and volatily calibration.}",
  doi = "10.22323/1.018.0020",
  journal = "PoS",
  year = 2006,
  volume = "CSTNA2005",
  pages = "020"
}