Jäschke, R.; Hotho, A.; Schmitz, C.; Ganter, B. & Stumme, G. (2008), 'Discovering Shared Conceptualizations in Folksonomies', Web Semantics: Science, Services and Agents on the World Wide Web 6 (1), 38--53.

Lehmann, F. & Wille, R. (1995), 'A triadic approach to formal concept analysis', Conceptual Structures: Applications, Implementation and Theory , 32--43.