1. R.E. Watson: Brookhaven National Laboratory, Upton, NY, and L. H. Bennett: National Bureau of Standards, Washington, DC, private communication, 1982.
2. P. R. Subramanian and J.F. Smith:CALPHAD, 1984, vol. 8, pp. 297–307.
3. J. Pelleg and O.N. Carlson:J. Less-Common Metals, 1965, vol. 9, pp. 281–88.
4. K. J. Strnat, W. Ostertag, N. J. Adams, and J. C. Olson:Proceedings of the 5th Rare Earth Research Conference, Ames, IA, August 30–September 1, 1965, vol. 5, pp. 67–74.
5. A.E. Ray:Cobalt, 1974, vol. 1, pp. 13–20.