Peter Lorenzen Brad Davis Guido Gerig Elizabeth Bullitt Sarang C. Joshi Multi-class Posterior Atlas Formation via Unbiased Kullback-Leibler Template Estimation. 95-102 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3216&spage=95 2004 conf/miccai/2004-1 MICCAI (1) db/conf/miccai/miccai2004-1.html#LorenzenDGBJ04