1. O. Winkler and R. Bakish:Vacuum Metallurgy, Elsevier Publishing Co., 1971.
2. J. Szekely and G. P. Martins:Chem. Eng. Sci., 1971, vol. 26, p. 147.
3. J. Szekely, G. P. Martins, and S-D Fang:VDI-Berichte, 1972, no. 182, pp. 13-22.
4. J. Szekely and S-D Fang:Chem. Eng. Sci., 1973, vol. 28, p. 2028.
5. A. V. Bradshaw and F. D. Richardson:Special Report Iron Steel Inst., no. 92, 1965, p. 24.