About this article
Published Online: Jan 24, 2020
Page range: 164 - 178
Received: Sep 17, 2019
Accepted: Nov 04, 2019
DOI: https://doi.org/10.2478/mjpaa-2019-0012
Keywords
© 2019 Albo Carlos Cavalheiro, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Cavalheiro, Albo Carlos
Department of Mathematics, State University of LondrinaLondrina, Brazil