1. 1T. G. Godfrey, J. A. Wooley, and J. M. Leitnaker , "Thermodynamic Functions of Nuclear Materials: UC, UC2,UO2, ThO2, and UN ," Tech. Rept. ORNL-TM-1596, revised, Dec.1966 .
2. 2O. Kubaschewski, E. L. Evans, and C. B. Alcock , Metallurgical Thermochemistry , 4th ed. ; p. 25 . Pergamon Press, Oxford, 1967 .
3. 3L. Brewer, L. A. Bromley, P. W. Gilles, N. L. Lofgren, and L. L. Quill ; p. 41, in Chemistry and Metallurgy of Miscellaneous Materials-Thermodynamics . McGraw-Hill Book Co., New York, 1950 .