Korinna Bade Andreas Nürnberger Rearranging Classified Items in Hierarchies Using Categorization Uncertainty. 125-132 2006 GfKl http://dx.doi.org/10.1007/978-3-540-70981-7_15 conf/gfkl/2006 db/conf/gfkl/gfkl2006.html#BadeN06