1. 1) L.J.Klinger, W.J.Barnett, R.P.Frohnberg and A.R.Troiano : Trans. ASM, 46 (1954), p.1557
2. 2) R.P.Frohnberg, W.J.Barnett and A.R.Troiano : Trans. ASM, 47 (1955), p.892
3. 3) W.H.Johnson : Proc. Manchester Lit. Phil. Soc., 13 (1874), p.60
4. 6) J.G.Harhai, T.S.Viswanathan and H.M.Davis : Trans. ASM, 58 (1965), p.210
5. 7) G.Naeser and N.Dautzenberg : Arch. Eisenhiittenwes., 36 (1965), p.175