@inproceedings{FiniteSemigroups,
  title = "Finite semigroups imposing tractable constraints",
  author = "Andrei Bulatov and Peter Jeavons and Mikhail Volkov",
  year = "2002",
  booktitle = "Proceedings of the School on Algorithmic Aspects of the Theory of Semigroups and its Applications, Coimbra, Portugal, 2001",
  pages = "313--329",
  publisher = "World Scientific, Singapore",
}