V. Malaise, L. Hollink, и L. Gazendam. Proceedings of the Workshop on Semantic Search (SemSearch 2008) at the 5th European Semantic Web Conference (ESWC 2008) Tenerife, Spain, June 2nd, 2008, стр. 44--58. (2008)
J. Sowa. Proceedings of the Linguistic on Conceptual Structures: Logical Linguistic, and Computational Issues, 1867, стр. 55 - 81. Springer-Verlag London, UK, (2000)
J. Kustanowitz, и B. Shneiderman. JCDL '05: Proceedings of the 5th ACM/IEEE-CS joint conference on Digital libraries, стр. 188--196. New York, NY, USA, ACM, (2005)