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1950 On the functions ${\rm Ci}(x,y)$ and ${\rm Si}(x,y)$
Tamotsu Tsuchikura
Tohoku Math. J. (2) 2(1): 68-73 (1950). DOI: 10.2748/tmj/1178245674
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Vol.2 • No. 1 • 1950
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