1. E.J. Lane:Metal Prog., April 1970, p. 68.
2. E. Haberling:Stahl u. Eisen, 1978, vol. 97, no. 9, p. 456.
3. H. Krainer:Arch. Eisenhuttenw., 1957, vol. 28, p. 81.
4. R. Vasudevan u. Majdic:Arch. Eisenhuttenw., 1963, vol. 34, p. 845.
5. K.J. Irvine, P. T. Llewellyn, and P. B. Pickering:JISI, 1966, vol. 199, p. 153.