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JUCS - Journal of Universal Computer Science 14(22): 3648-3657
doi:
10.3217/jucs-014-22-3648
Published:
28 Dec 2008
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Authors
Douglas S. Bridges 
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University of Canterbury, Christchurch, New Zealand
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Department of Mathematics and Computing Science, The University of the South Pacific, Fiji
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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.