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JUCS - Journal of Universal Computer Science 17(6): 874-890
doi:
10.3217/jucs-017-06-0874
Published:
28 Mar 2011
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Authors
Lynette van Zijl 
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Stellenbosch University, Stellenbosch, South Africa
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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.