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JUCS - Journal of Universal Computer Science 6(7): 621-649
doi:
10.3217/jucs-006-07-0621
Published:
28 Jul 2000
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Authors
Adriaan De Groot 
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Computing Science Institute, University of Nijmegen, University of Nijmegen, Netherlands
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Computing Science Institute, University of Nijmegen, University of Nijmegen, 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.