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JUCS - Journal of Universal Computer Science 14(19): 3250-3264
doi:
10.3217/jucs-014-19-3250
Published:
01 Nov 2008
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Authors
Barbara Leporini 
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ISTI - CNR, Pisa, Italy
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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.