K├Ârner, C.; Kern, R.; Grahsl, H.-P. & Strohmaier, M. (2010), 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' , ACM, New York, NY, USA , pp. 157--166 .