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2. M. Barmatz and I. Rudnick, Phys. Rev. 170, 224 (1968).
3. R. D. Williams and I. Rudnick, Phys. Rev. Lett. 25, 276 (1970)
4. R. D. Williams, Ph.D. Thesis, UCLA, (1970), unpublished. See, in particular, Table 1, p. 44 and 45.
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