1. V.Z. Erwin, Bearing and Gear Steels for Aerospace Applications, in NASA Tech. Memo. March 1990.
2. F.B. Pickering, Some beneficial effects of nitrogen in steel, in Proceeding High Nitrogen Steel Conf., Lille, 1988.
3. Physical metallurgy and design of the steel;Pickering;Applied Sciences,1983
4. High Nitrogen Steels Structure;Berns,1999
5. High nitrogen steels- Heat treatment of high nitrogen steels;Berns;Materials Australia,2001