Here's a brand new article citation...in case you need to update your
bibliography:

Preston Lewis, Steve Noble, and Neil Soiffer. 2010. Using accessible
math textbooks with students who have learning disabilities. In
Proceedings of the 12th international ACM SIGACCESS conference on
Computers and accessibility (ASSETS '10). ACM, New York, NY, USA,
139-146. DOI=10.1145/1878803.1878829
http://doi.acm.org/10.1145/1878803.1878829