1. Adaptive Technology Center Indiana University – Bloomington,
http://www.indiana.edu/~iuadapts/convers2.html
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3. Lecture Notes in Computer Science;C.N. Chu,2002
4. Computer Industry Almanac Inc., USA tops 160M Internet Users,
http://www.c-i-a.com/pr1202.htm
, December 16 (2002)
5. IBM Accessibility Center,
http://www-306.ibm.com/able/