@article{kaytom,
  title = "Colour image sementation by the vector-valued Allen-Cahn phase-field model: a multigrid solution",
  author = "D. Kay and A. Tomasi",
  year = "2009",
  journal = "IEEE Trans. Image Proc.",
  number = "10",
  pages = "2330--2339",
  volume = "18",
  doi = "10.1109/TIP.2009.2026678",
}