L. Mcdowell, O. Etzioni, A. Halevy, and H. Levy. WWW '04: Proceedings of the 13th international conference on World Wide Web, page 244--254. New York, NY, USA, ACM Press, (2004)
M. Steyvers, R. Shiffrin, and D. Nelson. Experimental Cognitive Psychology and its Applications: Festschrift in Honour of L Bourne, W Kintsch and T Landauer, (2004)