1. M. C. Flemings:Solidification Processing, Chpt. 4, McGraw Hill, N.Y., 1974.
2. R. J. Knight, C.-Y. Li, and C. W. Spencer:Trans. TMS-AIME, 1963, vol. 22, p. 18.
3. J. D. Livingston and H. E. Cline:Trans. TMS-AIME, 1969, vol. 245, p. 351.
4. F. D. Lemkey: U.S. Patent No. 3,434,827, March 25,1969.
5. G. A. Chadwick:Brit. J. Appl. Phys., 1965, vol. 16, p. 1095.