Schmitz, Christoph and Hotho, Andreas and Jäschke, Robert and Stumme, Gerd. Mining Association Rules in Folksonomies. Data Science and Classification (Proc. IFCS 2006 Conference). editor(s) Batagelj, V. and Bock, H.-H. and Ferligoj, A. and Žiberna, A.. Studies in Classification, Data Analysis, and Knowledge Organization, 261-270, Springer, Berlin/Heidelberg, Year 2006.

Mika, Peter. Ontologies Are Us: A Unified Model of Social Networks and Semantics. International Semantic Web Conference. LNCS, 522-536, Springer, Year 2005.

Heylighen, Francis. Bootstrapping knowledge representations: from entailment meshes via semantic nets to learning webs. In Kybernetes, (30) 5/6: 691--722, Year 2001.