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JUCS - Journal of Universal Computer Science 15(1): 3-32
doi:
10.3217/jucs-015-01-0003
Published:
01 Jan 2009
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Authors
Egon Börger 
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University of Pisa, Pisa, Italy
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University of Kiel, Kiel, Germany
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Christian Albrechts University Kiel, Kiel, Germany
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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.