B. Jansen, D. Booth, and A. Spink. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 1149--1150. New York, NY, USA, ACM, (2007)
C. Stolz, M. Barth, M. Viermetz, and K. Wilde. ICWE '06: Proceedings of the 6th international conference on Web engineering, page 225--232. New York, NY, USA, ACM, (2006)