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B. Krause, R. Jäschke, A. Hotho, и G. Stumme. HT '08: Proceedings of the Nineteenth ACM Conference on Hypertext and Hypermedia, стр. 157-166. New York, NY, USA, ACM, (2008)
D. Millen, J. Feinberg, и B. Kerr. CHI '06: Proceedings of the SIGCHI conference on Human Factors in computing systems, стр. 111--120. New York, NY, USA, ACM Press, (2006)