K├Ârner, Christian ; Kern, Roman ; Grahsl, Hans-Peter ; Strohmaier, Markus: Of categorizers and describers: an evaluation of quantitative measures for tagging motivation. In: HT '10: Proceedings of the 21st ACM Conference on Hypertext and Hypermedia. New York, NY, USA : ACM, 2010. - ISBN 978-1-4503-0041-4, S. 157--166