1. R.J. Fruehan, K. Ito, and B. Ozturk: Steel Res., 1989, vol. 60 (3–4), p. 129.
2. C. Böhm, A. Eberle, L. Gould, J. Kriechmair, and R. Wadlinger: Steel Times, 1995, No. 5, pp. 176–79.
3. V. Romenets: ISS Ironmaking 2000, Myrtle Beach, SC, Oct. 1994.
4. Hoogovens Technical Services Poland, Katowice, private communication, 1997.
5. G. Malgarini, A. DeCesare, A. DiDonato, P. Granati P, and G. Federico: Iron Steel Eng., 1997, Jan., pp. 30–31.