1. R.F. Domagala, J.J. Rausch and G.W. Levinson,Trans. ASM, 53, p 137–155 and 899–903 (1961).
2. J. Haefling and A.H. Daane, unpublished data quoted by C.E. Lundin inThe Rare Earths, F.H. Spedding and A.H. Daane, Eds., John Wiley & Sons, Inc., NY, p 252–253 (1961).
3. B.J. Beaudry, private communication of unpublished results of 1966, Ames Laboratory, Iowa State University, Ames, Iowa 50011.
4. A.H. Daane and F.H. Spedding, U.S. At. Energy Comm., 1SC-976, p 20–21 (1957).
5. V.N. Fedorov, A.A. Zhurba,Izv. Akad Nauk SSSR. Metally, No. 1, p 166–169 (1975) in Russian; translated inRuss. Met., No. 1, p 137–140 (1975).