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2. See, for example: , and , Quantum Chemistry, J. Wiley, 1944.
3. Atomic Energy Levels, Vol. I, NBS Circular No. 467, U.S. Government Printing Office, Washington D.C.
4. The Nature of the Chemical Bond, Cornell University Press, Ithaca (N.Y.) 1948.
5. A Quantitative Discussion of Bond Orbitals