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, 38--53.

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