1. German Federal Government: National Development Plan for Electric Mobility. https://www.bmu.de/en/download/the-federal-governments-national-development-plan-for-electric-mobility/ (2009). Accessed 11 Dec 2020
2. German National Platform for Electric Mobility (NPE): Progress Report 2018 - Market ramp-up phase. http://nationale-plattform-elektromobilitaet.de/en/the-npe/publications/ (2018). Accessed 11 Dec 2020
3. Federal Ministry of Transport and Digital Infrastructure (BMVI): The future of mobility is electric. https://www.bmvi.de/SharedDocs/EN/Dossier/Electric-Mobility-Sector/electric-mobility-sector.html (2019). Accessed 11 Dec 2020
4. Federal Ministry of Economic Affairs and Energy (BMWI): Electric mobility in Germany. https://www.bmwi.de/Redaktion/EN/Dossier/electric-mobility.html (2020). Accessed 11 Dec 2020
5. REFA: Grundlagen der Arbeitsgestaltung. Hanser, München (1993)