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April 1940Note on the computation of the differences of the ${\text{Si}}\left( x \right),{\text{Ci}}\left( x \right),{\text{Ei}}\left( x \right)$ and $ - {\text{Ei}}\left( { - x} \right)$ functions
Milton Abramowitz "Note on the computation of the differences of the ${\text{Si}}\left( x \right),{\text{Ci}}\left( x \right),{\text{Ei}}\left( x \right)$ and $ - {\text{Ei}}\left( { - x} \right)$ functions," Bulletin of the American Mathematical Society, Bull. Amer. Math. Soc. 46(4), 332-333, (April 1940)