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3. P.J.E., Forsyth, R.W., George and D.A., Ryder, Applied Materials Research 3 (1964) 223–228.
4. B., Harris, A.O., Ankara and M.A., McGuire, Journal of Physics D: Applied Physics 9 (1976) 365–372.
5. I.R., McColl and J.G., Morley, Journal of Physics D: Applied Physics 10 (1977) 599–616.