Andy Tsai William M. Wells III Simon K. Warfield Alan S. Willsky Level Set Methods in an EM Framework for Shape Classification and Estimation. 1-9 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3216&spage=1 2004 conf/miccai/2004-1 MICCAI (1) db/conf/miccai/miccai2004-1.html#TsaiWWW04