A minor revision is made to the author's 'A New Formula for Secondary Emission Yield' (ibid., vol.36, no.9, p.1963-7, September 1989) based on the work of A. Shih and C. Hor reported elsewhere in this issue (ibid. vol.40, no.4, p.824-9, Apr. 1993).>
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R.M. Vaughan (1993) studied this question.
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