R. Farrell, S. Liburd, and J. Thomas. Proceedings of the 13th international World Wide Web conference on
Alternate track papers & posters, page 162--169. New York, NY, USA, ACM, (2004)
F. Paganelli, O. Khaled, M. Pettenati, and D. Giuli. Web Engineering - 4th International Conference, ICWE 2004, Munich, Germany, July 26-30, 2004, Proceedings, volume 3140 of Lecture Notes in Computer Science, page 589--590. Springer, (2004)
P. Chirita, S. Costache, W. Nejdl, and S. Handschuh. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 845--854. New York, NY, USA, ACM, (2007)