1. G. Flemming, K. -E. Hensger: AISI Steel Technology. Jan. 2000, p.53.
2. B. Engl, M. Albedyhl, M. Brühl, C. Klinkenberg, H. Langner, H. Pircher, K. Wünnenberg: stahl und eisen Vol. 118 (1998), Nr. 5, p.41.
3. K. Hulka, J.M. Gray and F. Heisterkamp: Pipeline Technology, Volume II, Brügge (Belgium), 2000, p.291.
4. B. Soenen, S. Jacobs, C. Klinkenberg: Microalloyed Steels 2002, Materials Solutions Conference 7-9 October 2002, ASM International p.16.
5. Y. Li, D.N. Crowther, P.S. Mitchell, T.N. Baker: ibid.