1. International Energy Agency. Energy Technology Perspectives 2020 – Special Report on Clean Energy Innovation; 2020. doi: 10.1787/ab43a9a5-en.
2. Hyundai Motor Company. Road to Sustainability - 2020 Sustainability Report; 2020. https://www.hyundai.com/content/hyundai/ww/data/csr/data/0000000048/attach/english/hmc-2020-sustainability-report-en-v2.pdf.
3. Systematical Development of Sustainable Powertrains for 2030 and Beyond;Wukisiewitsch;MTZ Worldw,2020
4. Kaita, K. Diversified Electrification–The Key for Toyota’s Challenge towards a Sustainable Society. The 40th International Vienna Motor Symposium. 2019. Vienna. Austria. 15-17 May.
5. Uhlmann T, Alt N, Lückmann D, Balazs A, Zwar P, Müller A, Thewes M, Frese J. xHEV Concept Achieving 2030 CO2 Targets. The 42nd International Vienna Motor Symposium. 2021. Vienna. Austria. 29-30 April.