About this article
Published Online: Mar 04, 2019
Page range: 375 - 377
Received: Dec 02, 2017
DOI: https://doi.org/10.2478/ausm-2018-0029
Keywords
© 2018 Marius Tărnăuceanu, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
Tărnăuceanu, Marius
Faculty of Mathematics, “Al. I. Cuza” UniversityIaşi, Romania