Anagh Lal Berthe Y. Choueiry Constraint Processing Techniques for Improving Join Computation: A Proof of Concept. 149-167 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3074&spage=149 2004 conf/cdb/2004 CDB db/conf/cdb/cdb2004.html#LalC04