@inproceedings{Bulatov03:ijcai,
  title = "Amalgams of Constraint Satisfaction Problem",
  author = "Andrei A. Bulatov and Evgeny S. Skvortsov",
  year = "2003",
  booktitle = "Proceedings of the 18th International Joint Conference on Artificial Intelligence (IJCAI'03)",
  pages = "197-202",
}