1. Zhul’ev, S.I., Guzenkov, S.A., and Danilin, V.V., Combined effect of impurities in high-pure steel on the constructional strength of metal products, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 2004, no. 5, pp. 48–50.
2. Degenkolbe, J., Kalwa, G., and Kaup, K., Wirkung von Begleitelementen auf die Werkstoffeigenschaften, Stahl Eisen, 1988, vol. 108, pp. 527–536.
3. Kharchevnikov, V.P., Brodetskii, I.L., Trotsan, A.I., et al., The effect of trace metal admixtures on the quality of continuously casted steel, Stal’, 2001, no. 5, pp. 60–62.
4. LeMay, I. and McDonald Schetky, L., Copper in Iron and Steel, New York: Wiley, 1982.
5. Movshevich, E.I. and Motinga, N.F., Methods to ensure permissible copper content in electric steel, Elektrometallurgiya, 2000, no. 1, pp. 36–37.