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JUCS - Journal of Universal Computer Science 18(2): 177-193
doi:
10.3217/jucs-018-02-0177
Received:
11 Feb 2011 | Approved:
28 Oct 2011 | Published:
28 Jan 2012
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Authors
Nadeem Mahmood 
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University of Karachi, Karachi, Pakistan
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University of Karachi, Karachi, Pakistan
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Staffordshire University, Stafford, United Kingdom
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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.