Qiankun Zhao Sourav S. Bhowmick Sanjay Kumar Madria Discovering Pattern-Based Dynamic Structures from Versions of Unordered XML Documents. 77-86 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3181&spage=77 2004 conf/dawak/2004 DaWaK db/conf/dawak/dawak2004.html#ZhaoBM04