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Publicado en línea: 22 dic 2015
Páginas: 169 - 178
Recibido: 01 may 2013
Aceptado: 01 nov 2013
DOI: https://doi.org/10.2478/auom-2014-0057
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© 2014 Virgil Pescar et al., published by De Gruyter Open
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Virgil Pescar
Department of Mathematics, ”Transilvania” University of Braşov, Faculty of Mathematics and Computer Science, 500091 Braşov, Romania
Daniel Breaz
Department of Mathematics, ”1 Decembrie 1918” University of Alba Iulia, Faculty of Science, 510009 Alba Iulia, Romania.