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JUCS - Journal of Universal Computer Science 18(1): 44-61
doi:
10.3217/jucs-018-01-0044
Received:
15 Jul 2011 | Approved:
09 Dec 2011 | Published:
01 Jan 2012
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Authors
Peter B. Sloep
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Open Universiteit Nederland, Heerlen, Netherlands
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Open Universiteit Nederland, Heerlen, Netherlands
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Open Universiteit Nederland, Heerlen, Netherlands
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Open Universiteit Nederland, Heerlen, Netherlands
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Open Universiteit Nederland, Heerlen, Netherlands
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University of Piraeus, Piraeus, Greece
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Aurus KTS, Maastricht, Netherlands
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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.