@inproceedings{Bulatov03:conservative,
  title = "Tractable conservative Constraint Satisfaction Problems",
  author = "Andrei A. Bulatov",
  year = "2003",
  booktitle = "Proceedings of the 18th IEEE Symposium on Logic in Computer Science (LICS'03)",
  url = "http://csdl.computer.org/comp/proceedings/lics/2003/1884/00/18840321abs.htm",
}