1. European Commission, “Communication from the Commission to the European Parliament, the European Council, the Council, the European Economic and Social Committee and the Committee of the Regions. The European Green Deal” COM(2019) 640 final. Brussels, 11.12.2019.
2. Directive (EU) 2018/2001 of the European Parliament and of the Council of 11 December 2018 on the promotion of the use of energy from renewable sources. Official Journal of the European Union, 21.12.2018.
3. ACEA, The Automobile Industry Pocket Guide 2020-2021. European Automobile Manufacturers Association, 2020.
4. Hydrogen-fueled internal combustion engines;Verhelst;Prog Energy Combust Sci,2009
5. Conversion of a commercial spark ignition engine to run on hydrogen: performance comparison using hydrogen and gasoline;Sopena;Int J Hydrog Energy,2010