Haim J. Wolfson Spatial Pattern Detection in Structural Bioinformatics. 35-56 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2666&spage=35 2003 conf/msps/2003 Mathematical Methods for Protein Structure Analysis and Design db/conf/msps/msps2003.html#Wolfson03