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2. G.K. Wehner,Advance in Electronics and Electron Physics(Academic Press, New York, 1955)
3. G.K. Wehner, G.S. Anderson,Handbook of Thin Film Technology, edited by L.I. Maissel, R. Glang (Mc Graw-Hill, New York, 1970), Chaps. 3 and 4
4. W.D. Westwook,Progress in Surface Science(Pergamon, Oxford, 1976), p. 71
5. F. Llewellyn Jones,The Glow Discharge(Methuen London, Wiley, New York, 1966)