解説　参考文献

[1] ISSP ワークショップ「ヘリウム危機の現状と今後の課題」スライド
https://yamashita.issp.u-tokyo.ac.jp/ISSPWS191106/pawapo.html
[2] 村岡 宏一，表面科学 26, 274 (2005);
https://doi.org/10.1380/jsssj.26.274
[3] 河内 正夫，NTT 技術ジャーナル 2013.3, p.42;
https://www.ntt.co.jp/journal/1303/files/jn201303042.pdf
[4] P.V.E McClintock, J.K. Wigmore, D.J. Meredith 著，藤田 敏三, 大林 康二, 前野 悦輝 訳 「低温物理入門」(丸善, 1988)．
[5] APS Helium Report;
https://www.aps.org/policy/reports/popa-reports/helium-crisis.cfm
[6] P. W. Anderson, "Basic Notions of Condensed Matter Physics" (CRC Press, 1997).
[7] Bluefors PR page "IBM is Making the World's First Integrated Quantum System"
https://bluefors.com/ibm-integrated-quantum-system/
[8] CERN news "LHC filling with liquid helium at 4 kelvin"
https://home.cern/news/news/engineering/lhc-filling-liquid-helium-4-kelvin
[9] JAXA 「空と宙」2012， 7/8 月号，page 04
http://www.aero.jaxa.jp/publication/magazine/pdf/sorasora_no48.pdf
[10] Wikipedia "Helium production in the United States";
https://en.wikipedia.org/wiki/Helium_production_in_the_United_States
[11] Wikipedia "Helium privatization act of 1996";
https://en.wikipedia.org/wiki/Helium_Privatization_Act_of_1996
[12] National Research Council. 2000. The Impact of Selling the Federal Helium Reserve. Washington, DC: The National Academies Press.
https://doi.org/10.17226/9860
[13] Helium Stewardship Act of 2013;
https://www.congress.gov/113/plaws/publ40/PLAW-113publ40.pdf
[14] "BLM reaps surprising windfall from FY 2019 Crude Helium Auction", gas world;
https://www.gasworld.com/blm-reaps-windfall-from-fy-2019-helium-auction/2015344.article
[15] Helium Summit 2018;
https://www.gasworldconferences.com/conference/helium-summit-2018/
[16] 地質ニュース 1961 年 11 月号 No.87 (産総研，地質調査総合センター) p.1, 「ヘリウム資源について」;
https://www.gsj.jp/data/chishitsunews/61_11_01.pdf
[17] ヘリウム問題全国アンケート;
http://www.issp.u-tokyo.ac.jp/labs/cryogenic/info/lhe_jp_survey.pdf
[18] みずほ情報総研「ヘリウムの世界需給に関する調査」;
https://www.meti.go.jp/meti_lib/report/2015fy/000155.pdf