1. A. A. Babitsyn, M. A. Chernitsyna, and V. T. Kalinnikov, "Cr?Se phase diagram," Zh. Neorg. Khim.,20, No. 12, 3357 (1975).
2. Simadzu Hirosi et al., Tetsu-to Hagane,60, No. 11, 412 (1974).
3. Ya. E. Gol'dshtein and A. Ya. Zaslavskii, Structural Steels with High Machinability [in Russian], Metallurgiya, Moscow (1977).
4. C. Stoddart et al., Nature,273, No. 5488, 187 (1975).