1. DOE vehicle battery R&D: progress update 2011;Howell,2011
2. Porsche installs first 350 kW ultra-rapids in Berlin - zap-Map;Lane,2017
3. Porsche installs first 350-kW electric car charging station in Berlin;Szymkowski,2017
4. Porsche taycan price and specifications - EV database,2018
5. Audi e-tron GT price and specifications - EV Database,2018