[1] https://www.townnews.co.jp/0306/2016/04/21/329006.html
[2] https://www.okuraken.or.jp/en/
[3] https://shinhai.net/class_mountain/120.html
[4] https://www.alpine-tour.com/news_detail.php?keyno=352
[5] https://www.theuiaa.org/honouring-japanese-mountaineers/
[6] https://www.hmv.co.jp/artist_%E7%A5%9E%E5%B4%8E%E5%BF%A0%E7%94%B7_200000000746346/biography/
[7] https://www.sankei.com/article/20211205-TDLSESC4IRMXDCBFHCE7G6YDR4/
[8] https://nualpine.com/pdf/kaiho33_1996.4-2000.3.pdf
[9] https://nepalmountaineering.org/the-nma-commemorates-its-50th-anniversary
[10] https://www.gunmaken-sangakurenmei.net/document/sangakugunma/096.pdf
[11] https://www.jma-sangaku.or.jp/wp-content/uploads/2024/03/geppo660.pdf
[12] https://oldsite.theuiaa.org/members-area/general-assembly/new-officers-and-honorary-member-elected-at-uiaa-general-assembly-in-amsterdam/
[13] https://www.jma-sangaku.or.jp/wp-content/uploads/2024/06/20240606UAAA30%E5%91%A8%E5%B9%B4%E8%A8%98%E5%BF%B5%E4%BA%8B%E6%A5%AD_%E4%BC%81%E7%94%BB%E6%9B%B8.pdf
[14] https://www.smsca.or.jp/wp-content/uploads/2022/08/fd5a74eb8af06b9bf3169c2bce7050e7.pdf
[15] https://www.yanmar.com/global/about/history/
[16] https://jac.or.jp/sangakuhensyuu/1975optimisation.pdf
[17] https://www.eng.tohoku.ac.jp/english/research/search/
[18] https://jac1.or.jp/document/sangaku_back_number
[19] https://www.fujisan-net.jp/post_detail/2001975
[20] https://philosophy-japan.org/wpdata/wp-content/uploads/2018/04/20180404Tetsugaku.vol_.2.final_.pdf