1. James, T. E.Iron and Steel Engineer, 123–26, Feb (1966).
2. Andonev, S. M., et al,Stalin English, 5–11, Jan (1968).
3. Kingswood, K. S.Metallurgia, 55–62, Aug (1948).
4. Leonidov, N. K.Stalin English, 822–27, Oct (1967).
5. Tyler, L. W.The Magazine of Metals Producing, 83–7, Aug (1968).