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JUCS - Journal of Universal Computer Science 15(13): 2547-2565
doi:
10.3217/jucs-015-13-2547
Published:
01 Jul 2009
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Authors
Yi-Chung Chen 
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National Cheng Kung University, Tainan, Taiwan
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National Cheng Kung University, Tainan City, Taiwan
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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.