1. 1) S. Gunnarson, H. Ravenshorst and C. M. Bergstrom: Proc. Fundamentals of Microalloying Forging Steels Conf., AIME, USA, (1987), 325.
2. 2) W. A. Szilva, K. J. Grassl, J. W. Weith and P. H. Wright: Proc. Microalloyed Bar and Forging Steels Conf., TMS, Warrendale, PA, (1990), 227.