1. About CeL.
http://elearning.upt.ro/despre-cel/c-18
. Accessed June 2016
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4. Aspin, D., Chapman, J., Hatton, M., Sawano, Y. (eds.): International Handbook of Lifelong Learning. Kluwer, London (2001)
5. Berners-Lee, T., Hendler, J., Lassila, O.: The Semantic Web. Scientific American, p. 5 (2001)