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JUCS - Journal of Universal Computer Science 19(14): 2112-2126
doi:
10.3217/jucs-019-14-2112
Received:
03 Feb 2013 | Approved:
29 Jul 2013 | Published:
01 Aug 2013
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Authors
Rafael Pastor
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National Spanish Distance University of Spain, Madrid, Spain
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National Spanish Distance University of Spain, Madrid, Spain
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National Spanish Distance University of Spain, Madrid, Spain
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National Spanish Distance University of Spain, Madrid, Spain
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Spanish University for Distance Education (UNED), Madrid, Spain
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National Spanish Distance University of Spain, Madrid, Spain
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National Spanish Distance University of Spain, Madrid, Spain
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Conflict of interest
The authors have declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.