About this article
Published Online: Apr 18, 2017
Page range: 123 - 130
Received: Feb 06, 2017
Accepted: Apr 18, 2017
DOI: https://doi.org/10.21042/AMNS.2017.1.00010
Keywords
© 2017 Tetiana Klymchuk, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Klymchuk, Tetiana
Departament de Matemàtiques, Universitat Politècnica de CatalunyaBarcelona, Spain
Faculty of Mechanics and Mathematics, Taras Shevchenko National University of KyivKyiv, Ukraine