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http://www.daisy.org/z3998/2012/z3998-2012.html
2. National Information Standards Organization (NISO). ANSI/NISO Z39.86-2005. Revision of ANSI/NISO Z39.86-2002. Specifications for the Digital Talking Book,
http://www.daisy.org/z3986/2005/Z3986-2005.html
3. DAISY Consortium: ZedAI Introduction,
http://www.daisy.org/zw/ZedAIIntroduction
4. W3C. RDF Primer,
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5. Karshmer, A., Gupta, G., Pontelli, E.: Mathematics and Accessibility: a Survey. In: The Universal Access Handbook. CRC Press