PDFs and Accessibility
http://www.techdis.ac.uk/resources/pdfaccess.html

Draffan, E.A. and Sue Harrison
TechDis
2002

Abstract:

Adobe Acrobat Portable Document Format (PDF) is a file format that allows the page creator to ensure that all fonts, formatting and graphics etc are preserved throughout the document regardless of the platform on which it is being viewed. Due to the control the author has over the style of the document, a number of accessibility problems can be identified.