1. V.T. Aleksanyan, B.V. Lokshin, in: Structure of molecules and chemical bond, vol. 5, Vibrational Spectra of π-complexes of Transition Elements, Review on Science and Technique, Inst. Scientific Information, Moscow, 1976 (in Russian).
2. V.T. Aleksanyan, Vibrational spectra of sandwich complexes, in: J.R. Durig (Ed.), Vibrational Spectra and Structure, A Series of Advances, vol. 11, Elsevier, Amsterdam, 1982, ch. 3, p. 107.
3. K. Nakamoto, Infrared and Raman Spectra of Inorganic and Coordination Compounds, Wiley, New York, 1986.
4. E. Maslovsky, Vibrational Spectra of Organometallic Compounds, Wiley, New York, 1977.
5. Infrared and Raman Spectral Studies of π Complexes Formed Between Metals and CnHnRings