Tagging Dynamics in Online Communities.
In: HT '09: Proceedings of the Twentieth ACM Conference on Hypertext and Hypermedia. ACM, New York, NY, USA, 2009.
Vittorio Loreto and Andrea Capocci.
[BibTeX] 

Collaborative tagging as distributed cognition.
Pragmatics and Cognition, 14(2):275-285, 2006.
Luc Steels.
[doi]  [BibTeX]