H. Tonn-Eichstädt. Assets '06: Proceedings of the 8th international ACM SIGACCESS conference on Computers and accessibility, Seite 55--62. New York, NY, USA, ACM, (2006)
H. Takagi, C. Asakawa, K. Fukuda, und J. Maeda. Assets '04: Proceedings of the 6th international ACM SIGACCESS conference on Computers and accessibility, Seite 177--184. New York, NY, USA, ACM, (2004)