R. V. Calhoun et al., "Erratum: Excitation of the n=2 state of atomic hydrogen by electron impact in the distorted-wave approximation (Physical Review A (1977) 16, 2)," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 16, no. 2, American Physical Society (APS), Aug 1977.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.16.803
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© 1977 American Physical Society (APS), All rights reserved.