Ling Chen 0002 Sourav S. Bhowmick Liang-Tien Chia Mining Maximal Frequently Changing Subtree Patterns from XML Documents. 68-76 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3181&spage=68 2004 conf/dawak/2004 DaWaK db/conf/dawak/dawak2004.html#ChenBC04