(1-1) https://archive.ph/http://www2.sal.tohoku.ac.jp/soc/english/cgi-bin/wiki.cgi?page=KUWABARA+Tsukasa

(1-2) https://archive.ph/http://www2.sal.tohoku.ac.jp/soc/english/cgi-bin/wiki.cgi?action=SOURCE&page=KUWABARA+Tsukasa

(2-1) https://archive.ph/http://www2.sal.tohoku.ac.jp/soc/cgi-bin/wiki.cgi?page=%B7%AC%B8%B6%BB%CA

(2-2) https://archive.ph/http://www2.sal.tohoku.ac.jp/soc/cgi-bin/wiki.cgi?action=SOURCE&page=%B7%AC%B8%B6%BB%CA