1. A. von Engel,Ionized Gases, Clarendon Press, Oxford, (1955).
2. C. Le Jeune, J. P. Gilles, J. P. Grandchamp, and O. Kessi, Le Vide, Les Couches Minces, S.F.V. éd., Paris, No. 229, Nov. 85, pp. 145?155.
3. Chris. M. Horwithz,Appl. Phys. Lett. 43, 977 (1983).
4. J. D. Swift and M. J. R. Schwar,Electrical Probes for Plasma Diagnostics, LIFFE, London (1970).
5. H. Koenig,IBM J. Res. Dev. 14, 168, (1970).