Tom Kelsey Steve Linton Colva M. Roney-Dougal New Developments in Symmetry Breaking in Search Using Computational Group Theory. 199-210 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3249&spage=199 2004 conf/aisc/2004 AISC db/conf/aisc/aisc2004.html#KelseyLR04