E. Cazer. Tagging and Metadata for Social Information Organization Workshop in conjunction with the 16th International World Wide Web Conference, (мая 2007)
H. Wu, M. Zubair, и K. Maly. HYPERTEXT '06: Proceedings of the seventeenth conference on Hypertext and hypermedia, стр. 111--114. New York, NY, USA, ACM, (2006)