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JUCS - Journal of Universal Computer Science 15(6): 1381-1422
doi:
10.3217/jucs-015-06-1381
Published:
28 Mar 2009
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Authors

Klaus Weihrauch
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FernUniversität Hagen, Hagen, Germany
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University of Hagen, Hagen, 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.