Precise Isotope Shift Measurements Using Line Narrowing Induced by Laser RadiationRemoveR. H. Cordover, P. A. Bonczyk, and A. JavanPhys. Rev. Lett. 18, 730 (1967)
Symmetry, Superconvergence, and Sum Rules for Spectral FunctionsRemoveT. Das, V. S. Mathur, and S. OkuboPhys. Rev. Lett. 18, 761 (1967)
