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JUCS - Journal of Universal Computer Science 20(8): 1109-1129
doi:
10.3217/jucs-020-08-1109
Received:
04 Apr 2014 | Approved:
23 Jul 2014 | Published:
01 Aug 2014
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Authors
Dulce Domingos 
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University of Lisbon, Lisbon, Portugal
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University of Lisbon, Lisbon, Portugal
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University of Lisbon, Lisbon, Portugal
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Polytechnic Institute of Leiria, Leiria, Portugal
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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.