Michael Sannella, John Maloney, Bjorn Freeman-Benson, and Alan Borning, <a href="http://www.cs.washington.edu/research/projects/weird/www/spe-deltablue-93.html"> "Multi-way versus One-way Constraints in User Interfaces: Experience with the DeltaBlue Algorithm"</a>, Software--Practice and Experience, Vol. 23 No. 5, (May 1993), pages 529-566.  <LI>
