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JUCS - Journal of Universal Computer Science 14(2): 193-210
doi:
10.3217/jucs-014-02-0193
Published:
28 Jan 2008
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Authors
Benjamin Burkard 
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Universität zu Köln, Köln, Germany
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Ludwig-Max.-Universität. München, Germany
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University of Pretoria, Pretoria, South Africa
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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.