Authors
Yuichi Futa
Tokyo University of Technology, Tokyo, Japan
Hiroyuki Okazaki
Shinshu University Nagano, Japan
Yasunari Shidama
Shinshu University Nagano, Japan
© 2020 Yuichi Futa, Hiroyuki Okazaki, Yasunari Shidama, published by University of Białystok
This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 License.