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JUCS - Journal of Universal Computer Science 19(14): 2093-2111
doi:
10.3217/jucs-019-14-2093
Received:
03 Feb 2013 | Approved:
29 Jul 2013 | Published:
01 Aug 2013
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Authors
Alexander Mikroyannidis 
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The Open University, Milton Keynes, United Kingdom
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The Open University, United Kingdom
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The Open University, Milton Keynes, United Kingdom
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Open Universiteit, Heerlen, Netherlands
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Open University of the Netherlands, Heerlen, Netherlands
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Sofia University, Sofia, Bulgaria
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Sofia University, Sofia, Bulgaria
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Friedrich-Alexander-Universität, Erlangen, Germany
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Friedrich-Alexander-Universität, Erlangen, Germany
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Friedrich-Alexander-Universität, Erlangen, Germany
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Foundation for Research and Technology-Hellas, Heraklion, Greece
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Foundation for Research and Technology-Hellas, Heraklion, Greece
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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.