D. Hawking, T. Upstill, и N. Craswell. Proceedings of the 27thAnnual InternationalACM SIGIRConference on Research and Development in Information Retrieval., (2004)
A. Hotho, R. Jäschke, C. Schmitz, и G. Stumme. Proceedings of the Conceptual Structure Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures, стр. 87-102. (2006)