Schmitz, Christoph, Hotho, Andreas, Jäschke, Robert, Stumme, Gerd ; Batagelj, V., Bock, H.-H., Ferligoj, A., Žiberna, A.: Mining Association Rules in Folksonomies. In: Data Science and Classification (Proc. IFCS 2006 Conference). Berlin/Heidelberg : Springer, 2006 (Studies in Classification, Data Analysis, and Knowledge Organization). - Ljubljana. - ISBN 978-3-540-34415-5, S. 261-270

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

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