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JUCS - Journal of Universal Computer Science 16(20): 2956-2985
doi:
10.3217/jucs-016-20-2956
Published:
01 Nov 2010
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Author
Stephen J. Hegner 
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Umeå University, Umeå, Sweden
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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.