Progression of putaminal degeneration in multiple system atrophy: A serial diffusion MR study. - Klaus Seppi; Michael F. H. Schocke; Katherina J. Mair; Regina Esterhammer; Christoph Scherfler; Felix Geser; Christian Kremser; Sylvia Boesch; Werner Jaschke; Werner Poewe; Gregor K. Wenning (NeuroImage, 2006)