[1] suchowan's UniWiki Calendar/When/Exe/暦説明/本編/小説中の暦/ゲセン暦, http://www2u.biglobe.ne.jp/~suchowan/u/wiki.cgi?Calendar%2FWhen%2FExe%2F%E6%9A%A6%E8%AA%AC%E6%98%8E%2F%E6%9C%AC%E7%B7%A8%2F%E5%B0%8F%E8%AA%AC%E4%B8%AD%E3%81%AE%E6%9A%A6%2F%E3%82%B2%E3%82%BB%E3%83%B3%E6%9A%A6
[2] ゲセン暦: suchowan's blog, https://suchowan.at.webry.info/201801/article_25.html