@article{MR1922500,
  title = "Approximation of the stability number of a graph via copositive programming",
  author = "de Klerk, E. and Pasechnik, D. V.",
  year = "2002",
  issn = "1095-7189",
  journal = "SIAM J. Optim.",
  mrnumber = "MR1922500 (2003g:90053)",
  number = "4",
  pages = "875--892 (electronic)",
  volume = "12",
}