1. The electric vehicle: technology and expectations in the automobile age;Mom,2013
2. Electric cars will be cheaper than conventional vehicles by 2022;Carrington;Guardian,2016
3. Germanys bundesrat resolves end of internal combustion engine;Schmitt;Forbes,2016
4. Electric vehicles: approaching the tipping point;Sperling,2018
5. Rapidly falling costs of battery packs for electric vehicles;Nykvist;Nat Clim Chang,2015