On the expansion of a Coulomb potential in spherical harmonics
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The addition theorem for Legendre functions leads, as is well known, to a useful expansion formula of importance in the theory of electrostatic potentials, or, in an alternative notation,
[1] R. Heller. Theory of Some van der Waals Molecules , 1941 .
[2] G. Shortley,et al. The Theory of Atomic Spectra , 1935 .