1. D.C. Harris, M.D. Bertolucci, Symmetry and spectroscopy. An Introduction to Vibrational and Electronic Spectroscopy (Dover Publications, INC., New York, 1980)
2. E.B. Wilson, J.C. Decius, P.C. Cross, Molecular Vibrations: The Theory of Infrared and Raman Vibrational Spectra (Dover Publications, INC., New York, 1980)
3. K. Nakamoto, Infrared and Raman Spectra of Inorganic and Coordination Compounds, 6th edn. (Wiley, Hoboken, New Jersey, 2009)
4. F.S. Levin, An Introduction to Quantum Theory (Cambridge University Press, 2002)
5. P. Pulay, G. Fogarasi, F. Pong, J.E. Boggs, Systematic ab initio gradient calculation of molecular geometries, force constants, and dipole moment derivatives. J. Am. Chem. Soc. 101, 2550–2560 (1979)