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JUCS - Journal of Universal Computer Science 18(10): 1238-1258
doi:
10.3217/jucs-018-10-1238
Received:
30 Jun 2011 | Approved:
25 May 2012 | Published:
28 May 2012
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Authors
Robert Bucki 
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The College of Informatics and Management in Bielsko-Biała, Bielsko-Biała, Poland
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Silesian University in Opava, Karviná, Czech Republic
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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.