On the Computation of the Second Differences of the ${\Text{Si}}\left( X \Right),{\text{Ei}}\left( X \Right)$, and ${\Text{Ci}}\left( X \Right)$ Functions
Bulletin of the American Mathematical Society
doi 10.1090/s0002-9904-1939-07040-7
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Date
August 1, 1939
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American Mathematical Society (AMS)