M. Dubinko, R. Kumar, J. Magnani, J. Novak, P. Raghavan, and A. Tomkins. Visualizing tags over time. In Proceedings of the 15th International WWW Conference, May 2006.
 Roy T. Fielding. Architectural Styles and the Design of Network-based Software Architectures. PhD thesis, University of California, Irvine, 2000.
 B. Ganter. Algorithmen zur Formalen Begriffsanalyse. In B. Ganter, R. Wille, and K. E. Wolff, editors, Beitr¨age zur Begriffsanalyse , pages 241-254. B.I. Wissenschaftsverlag, 1987.
 B. Ganter and R. Wille. Formal Concept Analysis: Mathematical Foundations. Springer, 1999.
 Scott Golder and Bernardo A. Huberman. The structure of collaborative tagging systems. Technical report, Information Dynamics Lab, HP Labs, Aug 2005. [OpenAIRE]
 Tony Hammond, Timo Hannay, Ben Lund, and Joanna Scott. Social Bookmarking Tools (I): A General Review. D-Lib Magazine, 11(4), April 2005.
 Andreas Hotho, Robert J¨aschke, Christoph Schmitz, and Gerd Stumme. Information retrieval in folksonomies: Search and ranking. In Proceedings of the 3rd European Semantic Web Conference, Lecture Notes in Computer Science. Springer, 2006. (to appear).
 R. Kosala and H. Blockeel. Web mining research: A survey. SIGKDD Explorations, 2(1):1- 15, 2000.
 S. Krolak-Schwerdt, P. Orlik, and B. Ganter. TRIPAT: a model for analyzing three-mode binary data. In H. H. Bock, W. Lenski, and M. M. Richter, editors, Studies in Classification, Data Analysis, and Knowledge Organization, volume 4 of Information systems and data analysis, pages 298-307. Springer, Berlin, 1994.
 F. Lehmann and R. Wille. A triadic approach to formal concept analysis. In G. Ellis, R. Levinson, W. Rich, and J. F. Sowa, editors, Conceptual structures: applications, implementation and theory, volume 954 of Lecture Notes in Artificial Intelligence, pages 32-43. Springer Verlag, 1995.
 Ben Lund, Tony Hammond, Martin Flack, and Timo Hannay. Social Bookmarking Tools (II): A Case Study - Connotea. D-Lib Magazine, 11(4), April 2005.