Andrei A. Bulatov, Peter Jeavons. An Algebraic Approach to Multi-sorted Constraints. In Francesca Rossi, editor, Principles and Practice of Constraint Programming - CP 2003, 9th International Conference, CP 2003, Kinsale, Ireland, September 29 - October 3, 2003, Proceedings. Volume 2833 of Lecture Notes in Computer Science, pages 183-198, Springer, 2003. [doi]
Abstract is missing.