Michael Sannella, <a href="http://www.cs.washington.edu/research/projects/weird/www/debugging-ppcp-94.html"> "Analyzing and Debugging Hierarchies of Multi-Way Local Propagation Constraints"</a>, in Alan Borning (ed.), <em>Proceedings of the 1994 Workshop on Principles and Practice of Constraint Programming</em>, Springer-Verlag, Lecture Notes in Computer Science No. 874, pages 63-77.  <LI>
