@inproceedings{e.1951über,
title={Über den allgemeinen Integralsinus Si ($z, a$)},
author={E. Kreyszig},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203131437789732},
booktitle={Acta Mathematica},
volume={85},
number={1},
pages={117-181},
year={1951},
}