1. Aamodt A, Plaza E (1994) Case-based reasoning: foundational issues, methodological variations, and system approaches. IOS Press 7(1):39–59
2. Albert J, Höhn H (2003) Multimedia lectures for visually oriented medical disciplines. In: Computer science in perspective: essays dedicated to Thomas Ottmann. Springer-Verlag, New York, pp 1–12
3. Alto. Available: http://www.ccs-gmbh.com/alto/general.html . [Accessed: 08-Fév-2009]
4. A.nnotate.com: Upload, annotate, share. Available: http://a.nnotate.com/ . [Accessed: 01-Nov-2010]
5. Avestan Digital Archive (ADA). Available: http://ada.usal.es/ . [Accessed: 11-Nov-2009]