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Publicado en línea: 06 jun 2014
Páginas: 83 - 92
Recibido: 10 oct 2013
DOI: https://doi.org/10.2478/ausm-2014-0006
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© 2014
This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Róbert Szász
Sapientia Hungarian University of Transylvania Department of Mathematics and Informatics Târgu Mureş, Romania