1. Charles , J. Duplex Stainless Steels: Materials to Meet Your Needs Proc. 3 rd Int. Conf. on Duplex Stainless Steels 1991 Beaune 3/48
2. Charles , J. Structure and mechanical properties of duplex stainless steels Proc. 4 th Intern. Conf. On Duplex Stainless Steels 1994 Glasgow
3. Stainless Steels: State of the Art and Prospects;Roos,1997
4. Charles , J. Why and Where Duplex Stainless Steels Proc. 5th World Conf. on Duplex Stainless Steels 1997 Maastricht