About this article
Published Online: Apr 12, 2021
Page range: 219 - 226
Received: Nov 28, 2020
Accepted: Jan 31, 2021
DOI: https://doi.org/10.2478/amns.2021.1.00036
Keywords
© 2021 Biqing Wang, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Wang, Biqing
Endicott College of International Studies, Woosong UniversityDaejeon, Republic of Korea
School of Mathematics and Computer, Tongling UniversityTongling, China