1. WMO statement on the state of the global climate in 2019,2020
2. European Comission. Communication from the Commission to the European Parliament, the Council, the European Economic and Social Committee and the Committee of the Regions: A hydrogen strategy for a climate-neutral Europe 2020.
3. Hydrogen Council. Hydrogen decarbonization pathways: Potential supply scenarios; 2021.
4. Ausfelder F, Bazzanella A. Hydrogen in the Chemical Industry. In: Stolten, Detlef; Emonts, Bernd (Hg.) 2016 - Hydrogen Science and Engineering, p. 19–39.
5. Hydrogen: A renewable energy perspective,2019