A. Amin, S. Townsend, J. van Ossenbruggen, and L. Hardman. Human-Computer Interaction – INTERACT 2009, volume 5726 of Lecture Notes in Computer Science, Springer, Berlin / Heidelberg, (2009)
J. Aslam, E. Yilmaz, and V. Pavlu. SIGIR '05: Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval, page 27--34. New York, NY, USA, ACM Press, (2005)
S. Auer, C. Bizer, J. Lehmann, G. Kobilarov, R. Cyganiak, and Z. Ives. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 715--728. Berlin, Heidelberg, Springer Verlag, (November 2007)