1. Williams, G. (1978) Chem. Soc. Rev., 7, 89.
2. Berne, B. J. (1971) Physical Chemistry, An Advanced Treatise, Vol. VIIIB, H. Eyring, W. Jost and D. Henderson (eds.), Academic Press, New York, page 539.
3. Williams, G. and Crossley, J. (1977) Ann. Rep. A., The Chem. Soc., London, p. 77.
4. Hill, N. E., Vaughan, W., Price, A. H. and Davies, M. (1969) Dielectric Properties and Molecular Behaviour, Van Nostrand, New York.
5. McCrum, N. G., Read, B. E. and Williams, G. (1967) Anelastic and Dielectric Effects in Polymeric Solids, Wiley, London and New York.