1. IEA , Energy Technology Perspectives 2020 , 2020
2. Respiratory health effects of diesel particulate matter
3. World's First Fuel Cell Heavy-Duty Truck, Hyundai XCIENT Fuel Cell, Heads to Europe for Commercial Use – FuelCellsWorks , https://fuelcellsworks.com/news/worlds-first-fuel-cell-heavy-duty-truck-hyundai-xcient-fuel-cell-heads-to-europe-for-commercial-use/ , accessed 1 February 2021
4. European Commission , Sustainable and Smart Mobility Strategy , 2020
5. T.Walker , Why the Future of Long-Haul Heavy Trucking Probably Includes a lot of Hydrogen , 2021