1. 2) T.KUNITAKE: Trans. ISIJ, 7 (1967), p.254
2. 3) A.M. TURKALO and J.R. Low, Jr.: Trans. AIME, 212 (1958), p.750
3. 4) D.W. SMITH and R.F. HEHEMANN: JISI, 209 (1971), p.476
4. 5) K.J. IRVINE and F.B. PICKERING: JISI, 188 (1958), p.141
5. 6) A.R. Cox: JISI, 205 (1967), p.51