Hongxing He Graham J. Williams Jie Chen Simon Hawkins Chris Kelman Exploring Possible Adverse Drug Reactions by Clustering Event Sequences. 199-208 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3181&spage=199 2004 conf/dawak/2004 DaWaK db/conf/dawak/dawak2004.html#HeWCHK04