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Publicado en línea: 27 mar 2020
Páginas: 19 - 42
Recibido: 06 nov 2017
Aceptado: 16 may 2018
DOI: https://doi.org/10.2478/udt-2019-0003
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© 2019 Yukio Ohkubo et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Ohkubo, Yukio
Dept. of Businessv Administration, The International University of KagoshimaKagoshima, Japan
Strauch, Oto
Institue of Mathematics, Slovak Academy of SciencesBratislava, Slovakia