Grahl, M., Hotho, A. & Stumme, G. (2007). Conceptual Clustering of Social Bookmarking Sites. 7th International Conference on Knowledge Management (I-KNOW '07) (p./pp. 356-364), SEP, Graz, Austria: Know-Center.

Santos-Neto, E., Ripeanu, M. & Iamnitchi, A. (2007). Tracking User Attention in Collaborative Tagging Communities

Begelman, G., Keller, P. & Smadja, F. (2006). Automated Tag Clustering: Improving search and exploration in the tag space. WWW2006, May, , 22--26.

Heymann, P. & Garcia-Molina, H. (2006). Collaborative Creation of Communal Hierarchical Taxonomies in Social Tagging Systems (2006-10). Computer Science Department .

Mika, P. (2005). Ontologies Are Us: A Unified Model of Social Networks and Semantics. International Semantic Web Conference (p./pp. 522-536), : Springer.