Gudenau, H. W., D. Senk, A. Babich, C. Fröhling, O. S. Kueon, S. Wang, and X. Wieting. “CO2 Problems and Waste Recycling. Research at the Institute of Ferrous Metallurgy”. Revista De Metalurgia, vol. 41, no. 2, Apr. 2005, pp. 139-47, doi:10.3989/revmetalm.2005.v41.i2.198.