@article{1178245674,
author = {Tsuchikura, Tamotsu},
title = {On the functions ${\rm Ci}(x,y)$ and ${\rm Si}(x,y)$},
journal = {Tohoku Math. J. (2)},
volume = {2},
number = {2},
year = {1950},
pages = { 68-73},
language = {en},
url = {http://dml.mathdoc.fr/item/1178245674}
}
Tsuchikura, Tamotsu. On the functions ${\rm Ci}(x,y)$ and ${\rm Si}(x,y)$. Tohoku Math. J. (2), Tome 2 (1950) no. 2, pp. 68-73. http://gdmltest.u-ga.fr/item/1178245674/