@inproceedings{FunctionsOf,
  title = "Functions of multiple-valued logic and the complexity of constraint satisfaction: A short survey",
  author = "Andrei Krokhin and Andrei Bulatov and Peter Jeavons",
  year = "2003",
  booktitle = "Proceedings of 33rd IEEE International Symposium on Multiple-Valued Logic (ISMVL'03)",
  pages = "343--351",
  url = "http://www.cs.ox.ac.uk/activities/constraints/publications/ISMVL03survey.ps",
}