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JUCS - Journal of Universal Computer Science 18(9): 1218-1235
doi:
10.3217/jucs-018-09-1218
Received:
01 Dec 2011 | Approved:
28 Apr 2012 | Published:
01 May 2012
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Authors
Xiaojun Qian
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Nanjing Normal University, 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.