1. 1) B.B. HUNDY: J. Iron & Steel Inst. (U.K.), 178 (1954), 1, p.34-38
2. 2) K.J. IRVINE and F.B. PICKERING: Iron & Steel, 30 (1957), p.219-223
3. 3) S.C. DESAI: J. Iron & Steel Inst. (U.K.), 191 (1959), p.250-256
4. 4) B.L. BIGGS: J. Iron & Steel Inst. (U.K.), 192 (1959), p.361-377
5. 6) C.H. LORIG and A.R. ELSEA: Trans. Amer. Foundry. Assoc., 55 (1947), p.160-174