1. The associated Laguerre polynomials Ln+l+12l+2 and associated Legendre polynomials Plm are defined as in L. C. Pauling and E. B. Wilson,Introduction to Quantum Mechanics(McGraw-Hill Book Company, Inc., New York, 1935).
2. J. O. Hirschfelder and P.-O. Löwdin,Long Range Interaction of Two1s Hydrogen Atoms Expressed in Terms of Natural Spin Orbitals, Technical Report of the Quantum Chemistry Group, Uppsala University (1957).