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JUCS - Journal of Universal Computer Science 21(12): 1563-1576
doi:
10.3217/jucs-021-12-1563
Received:
22 May 2014 | Approved:
27 Jan 2015 | Published:
01 Dec 2015
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Authors
Cristian S. S. Calude 
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University of Latvia, Riga, Latvia
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National University of Singapore, Singapore, Singapore
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National University of Singapore, Singapore, Singapore
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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.