1. Gordon, R.G., 1968, Adv. Magn. Resonance, (Ed. Waugh, J.S.), 3, p.1,
2. Bailey, R.T. in ‘Molecular Spectroscopy’, Vol.2, 1974, Chem. Soc. Specialist Periodical Report, p. 173.
3. Clarke, J.H.R. in ‘Advances in Infrared and Raman Spectroscopy’ Vol. 4, 1978, ( Ed. Hester, R.E. and Clark, R.J.H.) Heyden, London, Chapter 4.
4. Yarwood, J, and Arndt, R. in ‘Molecular Association’ Vol.2, 1979, (Ed. Foster, R.), Wiley, New York, Chapter 4, pp. 267–329.
5. Kubo, R. in ‘Fluctuation, Relaxation and Resonance in Magnetic Systems’, (Ed. D. Ter Haar), 1962, Oliver and Boyd, London, pp. 23–68.