Daniela Barbosa, who is the business development manager for Synaptica at Dow Jones Client Solutions has written a fabulous eBook explaining how to mix taxonomies built by professionals and folksonomies, which let users tag content as they see fit
J. Gemmell, A. Shepitsen, M. Mobasher, und R. Burke. Proceedings of the 6th Workshop on Intelligent Techniques for Web Personalization and Recommender Systems, (Juli 2008)
M. Grahl, A. Hotho, und G. Stumme. 7th International Conference on Knowledge Management (I-KNOW '07), Seite 356-364. Graz, Austria, Know-Center, (September 2007)