1. European Commission, 2020a. A hydrogen strategy for a climate-neutral Europe. https://knowledge4policy.ec.europa.eu/publication/communication-com2020301-hydrogen-strategy-climate-neutral-europe_en.
2. METI – Japan Ministry of Economy, Trade and Industry, 2017. Basic Hydrogen Strategy. https://www.meti.go.jp/english/press/2017/pdf/1226_003a.pdf.
3. MOTIE – Korea Ministry of Trade, Industry and Energy, 2019. Hydrogen Economy Roadmap of Korea. https://docs.wixstatic.com/ugd/45185a_fc2f37727595437590891a3c7ca0d025.pdf.
4. COAG – Council of Australian Governments Energy Council, 2019. Australia's National Hydrogen Strategy. https://www.industry.gov.au/sites/default/files/2019-11/australias-national-hydrogen-strategy.pdf.
5. IEA – International Energy Agency, 2019. The future of hydrogen: seizing today’s opportunities. https://www.iea.org/reports/the-future-of-hydrogen.