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JUCS - Journal of Universal Computer Science 19(1): 78-109
doi:
10.3217/jucs-019-01-0078
Received:
03 Aug 2011 | Approved:
28 Dec 2012 | Published:
01 Jan 2013
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Authors
Aleksandar Spasić
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College of Professional Studies for Pre-School Teachers, Pirot, Serbia
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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.