1. 3) Report on the heterogenuity of steel ingot: CXIII (1926), p.38
2. 7) R.J. MCDONALD and J.D. HUNT: Met. Trans., 1 (1970), p.1787
3. 8) R. MEHRABIAN, M. KEANE, and M.C. FLEMINGS: Met. Trans., 1 (1970), p.1209
4. 9) C. SYKES, H.H. BURTON, and C.C. BEGG: JISI, 156 (1947), p.155
5. 12) A. HULTGREN: JISI, 120 (1929), p.67