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JUCS - Journal of Universal Computer Science 19(13): 1963-1985
doi:
10.3217/jucs-019-13-1963
Received:
23 Oct 2012 | Approved:
28 Jun 2013 | Published:
01 Jul 2013
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Authors
Cheng Xie 
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Shanghai Jiao Tong University, Shanghai, China
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Shanghai Jiao Tong University, Shanghai, 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.