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The author discusses the value of the now-released Swerling (1996) paper (ibid., pp. 698-709) in which chi-square target models replace the now-obsolete Swerling models and the merits of the papers by Xu & Huang (ibid., pp. 710-14) and Johnston (ibid., pp. 715-20).
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S.L. Johnston (1997) studied this question.
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