Direct Sum-of-States Calculations of the Frequency-Dependent Polarizability of
A. Dalgarno, A. Lewis Ford, and J. C. Browne
Phys. Rev. Lett. 27, 1033 (1971) - Published 18 October, 1971
Hyperfine Structures of Optically Inaccessible Excited Atomic States
S. Chang, R. Gupta, and W. Happer
Phys. Rev. Lett. 27, 1036 (1971) - Published 18 October, 1971