1. J. G.D. Hobbs, J.A. Wesson, Culham Laboratory Report CLM-R57 (1966)
2. G.D. Hobbs, J.A. Wesson, Plasma Phys. 9:85 (1967)
3. P.J. Harbour, M.F.A. Harrison, Nucl. Fusion 19:695 (1979)
4. G. Fuchs, A. Nicolai, Nucl. Fusion 20:1247 (1980)
5. R. Gomer, Field Emission and Field Ionization, Harvard University Press (1961)