Yida Wang Ee-Peng Lim San-Yih Hwang Efficient Group Pattern Mining Using Data Summarization. 895-907 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2973&spage=895 2004 conf/dasfaa/2004 DASFAA db/conf/dasfaa/dasfaa2004.html#WangLH04