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Robert E. Greenwood, Numerical Integration for Linear Sums of Exponential Functions, The Annals of Mathematical Statistics, Vol. 20, No. 4 (Dec., 1949), pp. 608-611 ...
Frank E. Harris, Tables of the Exponential Integral Ei (x), Mathematical Tables and Other Aids to Computation, Vol. 11, No. 57 (Jan., 1957), pp. 9-16 ...
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