About this article
Published Online: Dec 22, 2015
Page range: 169 - 178
Received: May 01, 2013
Accepted: Nov 01, 2013
DOI: https://doi.org/10.2478/auom-2014-0057
Keywords
© 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.