1. World Steel Association: Steel Statistical Yearbook 2018: Worldsteel
2. The European Steel Association: A steel roadmap for a low carbon Europe 2050: EUROFER, 2013
3. Ripke, J.; Kopfle, J.: MIDREX H2: Ultimate Low CO2 Ironmaking and its place in the new Hydrogen Economy, Direct from MIDREX, 3rd quarter 2017, pp 7–12
4. Weigel, M.: Ganzheitliche Bewertung zukünftig verfügbarer primärer Stahlherstellungsverfahren, Doctoral thesis, Wuppertal University, 2014
5. MIDREX: The MIDREX Process. The World’s most reliable and productive Direct Reduction Technology, November 2012