1. W. G. Brown and G. E. Gibson, Phys. Rev. 40, 529 (1932).PHRVAO0031-899X
2. J. H. Van Vleck, Phys. Rev. 40, 544 (1932).PHRVAO0031-899X
3. W. G. Brown, Phys. Rev. 42, 355 (1932).PHRVAO0031-899X
4. G. Herzberg, Molecular Spectra and Molecular Structure (Prentice‐Hall, 1939), p. 485.
5. See, for example, reference 4, p. 486, and W. M. Latimer and J. H. Hildebrand, Reference Book of Inorganic Chemistry (Macmillan, 1940), p. 154.