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4. James, B. 2018 Cost Projections of PEM Fuel Cell Systems for Automobiles and Medium-Duty Vehicles (Office of Energy Efficiency and Renewable Energy, DOE, Strategic Analysis, 2018); https://www.energy.gov/sites/prod/files/2018/04/f51/fcto_webinarslides_2018_costs_pem_fc_autos_trucks_042518.pdf
5. Satyapal, S. 2017 Annual Progress Report: DOE Hydrogen and Fuel Cells Program (Office of Scientific and Technical Information, DOE, 2018); https://www.osti.gov/servlets/purl/1460682