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Publicado en línea: 20 ago 2020
Páginas: 483 - 492
Recibido: 28 nov 2019
Aceptado: 01 feb 2020
DOI: https://doi.org/10.2478/amns.2020.2.00024
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© 2020 Zhangjie Sun, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Sun, Zhangjie
Faculty of Management and Economics, Kunming University of Science and TechnologyKunming, China