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JUCS - Journal of Universal Computer Science 15(1): 72-111
doi:
10.3217/jucs-015-01-0072
Published:
01 Jan 2009
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Author
Lindsay Groves 
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Victoria University of Wellington, Wellington, New Zealand
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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.