1. Key world, energy trends, except from: world energy balances. Technical report, International Energy Agency (2016)
2. Lopez, J.A., Herrera, V. I., Camblong, H., Milo, A., Gaztanaga, H.: Energy management improvement based on fleet learning for hybrid electric buses. In: 2018 IEEE Vehicle Power and Propulsion Conference (VPPC), Chicago, IL, pp. 1–6 (2018). https://doi.org/10.1109/VPPC.2018.8605025
3. Heavy-duty vehicles CO $$_{2}$$ emissions and fuel efficiency. http://www.europarl.europa.eu/legislative-train/theme-resilient-energy-union-with-a-climate-change-policy/file-heavy-duty-vehicles-co2-emissions-and-fuel-efficiency , 20-04-2018. Accessed 21 May 2018
4. Vedlugaite, D.: Greenhouse gas emissions from transport. Technical report, European Environment Agency (2018)
5. Bulc, V.: An overview of electric buses in Europe. Technical report (2017)