1. Udin, Shaler, and Wulff: Trans. AIME (1949) 185, p. 186; Journal of Metals (February 1949).
2. Udin: Journal of Metals (January 1951) Trans. AIME, p. 63.
3. Greenough: Report to Ministry of Supply No. 52. London.
4. Buttner: ScD Thesis, M.I.T. (1951).
5. Smith: Trans. AIME (1948) 175, p. 15; Metals Technology (June 1948).