MathSciNet bibliographic data MR791977 65D20 (33A70) Amos, D. E. Uniform asymptotic expansions for exponential integrals $E_n(x)$$E_n(x)$ and Bickley functions ${\rm Ki}_n(x)$${\rm Ki}_n(x)$. ACM Trans. Math. Software 9 (1983), no. 4, 467–479. Article

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