1. V. Paschkis and T. Mirsepassi: Iron & Steel Engineer, June 1956, vol. 33, pp. 116–132.
2. E. M. Summers: JISI, 1960, vol. 195, pp. 405–409.
3. N. V. Krepyshev: Metallurg, 1958, vol. 11, pp. 3–8, (Brutcher 4550).
4. Steel In Soviet Union, AISI. 1959, pp. 149–150.
5. S. V. Kochinev: Metallurgist, 1962, vol. 3, pp. 104–108.