About this article
Published Online: Mar 27, 2020
Page range: 1 - 10
Received: Apr 25, 2017
Accepted: Apr 09, 2018
DOI: https://doi.org/10.2478/udt-2019-0001
Keywords
© 2019 Shigeki Akiyama et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Akiyama, Shigeki
University of TsukubaIbaraki, Japan
Jiang, Yunping
Queens College of CUNY Flushing
The CUNY Graduate SchoolNew York