Lacuna Restoration: How to choose a neutral colour?

@InProceedings\{MuV2010,
  author       = "Naila Murray and Eduard V\'azquez",
  title        = "Lacuna Restoration: How to choose a neutral colour?",
  booktitle    = "Proceedings of CREATE 2010 Conference",
  month        = "June",
  year         = "2010",
  editor       = "Gabriele Simone, Jon Yngve Hardeberg, Ivar Farup",
  keywords     = "Color, lacuna resotration, eye-tracking",
  keywords     = "Color, lacuna resotration, eye-tracking",
  url          = "http://cat.uab.cat/Public/Publications/2010/MuV2010"
}