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Published Online: 2012-10-12Published in Print: 2012-12-01Citation Information:Open Mathematics. Volume 10, Issue 6, Pages 1928–1939, ISSN (Online) 2391-5455, DOI: https://doi.org/10.2478/s11533-012-0107-6, October 2012© 2012 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)