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Published Online: 2013-12-19Published in Print: 2013-10-01Citation Information:Open Physics. Volume 11, Issue 10, Pages 1528–1535, ISSN (Online) 2391-5471, DOI: https://doi.org/10.2478/s11534-013-0252-y, December 2013© 2013 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)