P. Thomas Fletcher Sarang C. Joshi Principal Geodesic Analysis on Symmetric Spaces: Statistics of Diffusion Tensors. 87-98 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3117&spage=87 2004 conf/eccv/2004w ECCV Workshops CVAMIA and MMBIA db/conf/eccv/eccv2004w.html#FletcherJ04