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JUCS - Journal of Universal Computer Science 19(1): 25-52
doi:
10.3217/jucs-019-01-0025
Received:
01 Jan 2012 | Approved:
28 Dec 2012 | Published:
01 Jan 2013
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Authors
State University of Maringa, Maringa, Brazil
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University of Sãao Paulo, São Carlos, Brazil
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The Open University, Milton Keynes, United Kingdom
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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.