Lipczak, Marek ; Hu, Yeming ; Kollet, Yael ; Milios, Evangelos ; Eisterlehner, Folke (Bearb.) ; Hotho, Andreas (Bearb.) ; Jäschke, Robert (Bearb.): Tag Sources for Recommendation in Collaborative Tagging Systems. 497. In: ECML PKDD Discovery Challenge 2009 (DC09), 2009 (CEUR-WS.org), S. 157--172