1. Enrique Argones-Rúa, Elisardo González-Agulla, Carmen García-Mateo, Óscar W. Márquez-Flórez, User verification in a Bio-VXML framework. Odyssey 2004.
2. E-learning Platform WebCT <
http://www.webct.com/
>
3. E-learning Platform LearningSpace <
http://www.lotus.com/products/learnspace.nsf/wdocs/homepage?opendocument
>
4. E-learning Platform BlackBoard
http://www.blackboard.com/
5. ILIAS open source <
http://www.homer.ILIAS.unikoeln.de/ILIASdoc/doc/html/1.html
> 2003.15 September.