1. 1) Hydrogen and Fuel Cell Strategy Council: The Strategic Road Map for Hydrogen and Fuel Cells - Industry-academia-government action plan to realize a “Hydrogen Society” -, (March 12, 2019), https://www.meti.go.jp/english/press/2019/pdf/0312_002b.pdf, (accessed 2021-09-09).
2. 2) The Association of Hydrogen Supply and Utilization Technology (HySUT): The Situation Surrounding FCV and Hydrogen Supply Station, (July 21, 2017), https://www.fdma.go.jp/singi_kento/kento/items/kento223_03_shiryo1-2-1.pdf, (accessed 2021-09-09), (in Japanese).
3. 3) M.Nagumo: Suisozeisei no Kiso (Basis of Hydrogen Embrittlement), Uchida Rokakuho Publishing, Tokyo, (2008), 197 (in Japanese).
4. 4) F.Terasaki and N.Takano: Materia Jpn., 33(1994), 922 (in Japanese). https://doi.org/10.2320/materia.33.922
5. 5) G.R.Caskey, Jr.: Hydrogen Degradation of Ferrous Alloys, ed. by R.A.Oriani, J.P.Hirth and M.Smialowski, Noyes Publications, Park Ridge, NJ, (1985), 855.