Amy Gips Philip A. DiMattia James Gips The Effect of Assistive Technology on Educational Costs: Two Case Studies. 206-213 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3118&spage=206 2004 conf/icchp/2004 ICCHP db/conf/icchp/icchp2004.html#GipsDG04