[title in Japanese]

Released on J-STAGE: April 10, 2014 | Volume 30 Issue 1 Pages 63-67

[title in Japanese]

Released on J-STAGE: August 02, 2014 | Volume 30 Issue 2 Pages 1-11

[title in Japanese]

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

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: October 16, 2017 | Volume 33 Issue 2 Pages 35-47

Toyohiko ITO