1. J. Wesson et al., Tokamaks (Oxford University Press, Oxford 1987).
2. L. Spitzer, Physics of Fully Ionized Bases (Interscience, New York 1962).
3. J.W. Connor, in Ref. 1, p. 95. (1987).
4. R.S. Pease, Plasma Physics and Controlled Fusion, 29, 1171 (1987).
5. A. Gibson, paper given at the Institute of Physics, Plasma Physics Conference, York, July 1989, and Culham News Sheet, June 1989.