1. Zakkour, P.; Cook, G. CCS Roadmap for Industry—High purity CO2 sources: Sectoral assessment-final draft report; Global Technology Roadmap for CCS in Industry; Carbon Counts Company: U.K., 2010.
2. Hydrogen and fuel cells in city transport
3. Stephens, J.; Cartagena, W. Liquid Hydrogen Propellant Tank Sub-Surface Pressurization with Gaseous Helium; Scientific and Technological Information Program, NASA: Washington, D.C., 2015.
4. Review and evaluation of hydrogen production methods for better sustainability