1. 1) Steel Statistical Yearbook 2002, ed. by International Iron and Steel Institute, Brussels, (2002), 13.
2. Inclusion Characteristics in Bearing Steel Before and During Ingot Casting
3. 4) P. K. Trojan: ASM Handbook, 15 (Casting), ASM International, Ohio, (1988), 88.
4. 5) G. Pomey and B. Trentini: Int. Conf. on Production and Application of Clean Steels, The Iron and Steel Institute, London, (1970), 1.