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JUCS - Journal of Universal Computer Science 10(7): 751-768
doi:
10.3217/jucs-010-07-0751
Published:
28 Jul 2004
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Author
D. A. Turner 
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Middlesex University, 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.