C. Goble, S. Harper, and R. Stevens. Proceedings of the Eleventh ACM on Hypertext and hypermedia, page 1--10. New York, USA, ACM Press, (June 2000)Winner of the Doug Engelbart Award for Best Paper.
S. Harper, C. Goble, R. Stevens, and Y. Yesilada. Proceedings of the ACM SIGACCESS Conference on Computers and Accessibility, page 63--70. ACM Press, (October 2004)