Simplified calculation of $\mathrm {Ei}(x)$ for positive arguments, and a short table of $\mathrm {Shi}(x)$
Authors:
Robert F. Tooper and John Mark
Journal:
Math. Comp. 22 (1968), 448449
DOI:
https://doi.org/10.1090/S0025571868998724
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References  Additional Information

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Article copyright:
© Copyright 1968
American Mathematical Society