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Research sponsored in part under Contract Nonr-225 (52) (NR-342-022), office of Naval Research, at Stanford University.
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Ruben, H. A convergent asymptotic expansion for Mill's ratio and the normal probability integral in terms of rational functions. Math. Ann. 151, 355–364 (1963). https://doi.org/10.1007/BF01470826
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DOI: https://doi.org/10.1007/BF01470826