D. Stenmark. Proceedings of the XXXV Annual Hawaii International Conference on System Sciences (HICSS-02), 7-10 January, IEEE, (2002)Exteneded version available from http://w3.informatik.gu.se/~dixi/.
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)