[title in Japanese]

Released on J-STAGE: May 01, 2021 | Volume 36 Issue 2 Pages 27-32

[title in Japanese]

Released on J-STAGE: April 15, 2017 | Volume 33 Issue 1 Pages 37-42

[title in Japanese]

Released on J-STAGE: April 27, 2018 | Volume 34 Issue 1 Pages 44-50

Historical study on the origins of relays and transition process of rules:

Released on J-STAGE: April 21, 2020 | Volume 36 Issue 1 Pages 1-16

Toshihiro Seino

[title in Japanese]

Released on J-STAGE: May 01, 2021 | Volume 36 Issue 2 Pages 33-38