1. 1) K. Baumert, T. Herzog and J. Pershing: Navigating the Numbers: Greenhouse Gas Data and International Climate Policy 2005, World Resources Institute, http://www.wri.org (accessed December 2011).
2. 2) Worldsteel Association: Fact sheet: Breakthrough technologies, Worldsteel Association, http://www.worldsteel.org (accessed December 2009).
3. 3) J-P. Birat and F. Hanrot: 5th European Coke and Ironmaking Cong., Vol. 2, Jernkontoret, Stockholm, (2005), We7.4-1.
4. 4) M. Wadsley: Proc. of Int. Symp. on Greenhouse gases in the Metallurgical Industries: Policies, Abatement and Treatment, Met. Soc. CIM, Montreal, (2001), 3.
5. 5) M. Pelaez-Samaniego, M. Garcia-Perez, L. Cortez, F. Rosillo-Calle and J. Mesa: Renew. Sust. Energ. Rev., 12 (2008), 1063.