R. Burke, B. Mobasher, C. Williams, and R. Bhaumik. KDD '06: Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining, page 542--547. New York, NY, USA, ACM Press, (2006)
H. Kwon, T. Pardo, and G. Burke. dg.o '06: Proceedings of the 2006 international conference on Digital government research, page 277--284. New York, NY, USA, ACM Press, (2006)