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2. Molecular Spectra and Molecular Structure, Vol. III (van Nostrand Reinhold, New York, 1966).
3. Coulson's Valence, 3rd ed. (Oxford University Press, Oxford, 1979).
4. Quanta; A Handbook of Concepts, 2nd ed. (Oxford University Press, Oxford, 1991).
5. Quantum Chemistry, 4th ed. (Prentice Hall, Englewood Cliffs, NJ, 1991).