MathSciNet bibliographic data MR362844 65D20 Stegun, Irene A.; Zucker, Ruth Automatic computing methods for special functions. II. The exponential integral \$E\sb{n}(x)\$$E\sb{n}(x)$. J. Res. Nat. Bur. Standards Sect. B 78B (1974), 199–216. Links to the journal or article are not yet available

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