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JUCS - Journal of Universal Computer Science 19(6): 750-770
doi:
10.3217/jucs-019-06-0750
Received:
25 Apr 2012 | Approved:
25 Mar 2012 | Published:
28 Mar 2013
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Authors
Tahereh Jafarikhah 
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University of Tarbiat Modares, Tehran, Iran
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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.