Gudenau, H. W., Senk, D., Babich, A., Fröhling, C., Kueon, O. S., Wang, S. and Wieting, X. (2005) “CO2 Problems and waste recycling. Research at the Institute of ferrous metallurgy”, Revista de Metalurgia, 41(2), pp. 139–147. doi: 10.3989/revmetalm.2005.v41.i2.198.