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August 1939On 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
A. N. Lowan "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, Bull. Amer. Math. Soc. 45(8), 583-588, (August 1939)