Adam Schenker Mark Last Horst Bunke Abraham Kandel Comparison of Distance Measures for Graph-Based Clustering of Documents. 202-213 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2726&spage=202 2003 conf/gbrpr/2003 GbRPR db/conf/gbrpr/gbrpr2003.html#SchenkerLBK03