1. http://www.japan.go.jp/tomodachi/2016/spring2016/tokyo_realize_hydrogen_by_2020.html.
2. German Energy Agency (Dena) .
3. http://h2-mobility.de/en.
4. https://www.hydrogen.energy.gov/pdfs/review16/scs026_brooks_2016_o.pdf.
5. Hydrogen-induced degradation of rubber seals;Yamabe,2012