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JUCS - Journal of Universal Computer Science 10(5): 630-649
doi:
10.3217/jucs-010-05-0630
Published:
28 May 2004
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Authors
Linqiang Pan 
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Huazhong University of Science and Technology, Hubei, China, and Rovira i Virgili University, Tarragona, Spain
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Rovira i Virgili University, Tarragona, Spain
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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.