1. C. Wagner:Advances in Catalysis, vol. 21, pp. 323–81, Academic Press, 1970.
2. E. T. Turkdogan and J. V. Vinters:Met. Trans., 1972, vol. 3, pp. 1561–74.
3. W. Pluschkell and H. Yoshikoshi:Arch. Eisenhuettenw., 1970, vol. 41, pp. 715–21.
4. H. Yoshikoshi, M. Tokuda, and M. Ohtani:J.J.I.M., 1972, vol. 36, pp. 1093–2000.
5. W. Pluschkell and B. V. S. Sarma:Arch. Eisenhuettenw., 1973, vol. 44, pp. 161–66.