1. A. Goldberg andT. B. Massalski, Plutonium 1970, 2 Metall. Soc. and Am. Inst. Min. Met., Petrol. Eng., Inc., New York, p. 875.
2. F. L. Oetting, M. H. Rand andR. J. Ackermann, “The Chemical Thermodynamics of Actinide Elements and Compounds”, Part 1. The Actinide Elements, International Atomic Energy Agency, Vienna, pp 24, 1976.