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JUCS - Journal of Universal Computer Science 15(6): 1280-1300
doi:
10.3217/jucs-015-06-1280
Published:
28 Mar 2009
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Author
Arno Pauly 
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University of Cambridge, Cambridge, United Kingdom
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Conflict of interest
The author has declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.