1. G. W. PARKER, G. E. CREEK, G. M. HEBERT, P. W. LANTZ, W. J. MARTIN, Report ORNL-499, 1949, p. 45.
2. G. W. LEDDICOTTE, Repor NAS-NS-3030, 1960, p. 21.
3. D. R. LIDE, Handbook of Chemistry and Physics, 73rd ed., CRC Press, Boca Raton, 1991.
4. This value is provided by the Chinese Nuclear Data Center from JENDL-3.
5. D. C. KOCHER, Nucl. Data Sheets, 16 (1975) 55.