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JUCS - Journal of Universal Computer Science 15(2): 426-443
doi:
10.3217/jucs-015-02-0426
Published:
28 Jan 2009
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Authors
Jinwei Wang 
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CETC, Nanjing, China
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France Telecom R&D Beijing, Beijing, China
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Nanjing University of Science and Technology, Nanjing, China
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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.