@article{MR2092261,
  title = "On approximate graph colouring and {MAX}-{$k$}-{CUT} algorithms based on the {$\vartheta$}-function",
  author = "de Klerk, E. and Pasechnik, D. V. and Warners, J. P.",
  year = "2004",
  issn = "1382-6905",
  journal = "J. Comb. Optim.",
  mrnumber = "MR2092261",
  number = "3",
  pages = "267--294",
  volume = "8",
}