1. 1) D. Horstmann and F. Peters: Proc. of 9th Inter. Conf. on H.D.G., (1971), p. 75.
2. 2) A. A. Hershman: Proc. of 7th Inter. Conf. on H.D.G., (1967), p. 189.
3. 3) A. A. Hershman: Proc. of 8th Inter. Conf. on H.D.G., (1969), p. 3.
4. 4) D. Horstmann and F. Peters: Arch. Eisenhüttenw., 40 (1969), 621.
5. 5) H. Grubitsch: Stahl u. Eisen, 67 (1937), 819.