Janez Brank Marko Grobelnik Dunja Mladenic Predicting Category Additions in a Topic Hierarchy. 315-329 2008 ASWC http://dx.doi.org/10.1007/978-3-540-89704-0_22 conf/aswc/2008 db/conf/aswc/aswc2008.html#BrankGM08