Authors
Morteza Norouzi
Department of Mathematics, Faculty of Basic Sciences, University of Bojnord,, Bojnord, Iran
Violeta Leoreanu-Fotea
Faculty of Mathematics, University of Al.I. Cuza of Iasi,, Iasi, Romania
© 2017 Morteza Norouzi, Violeta Leoreanu-Fotea, published by Ovidius University of Constanta
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.