MathSciDoc: An Archive for Mathematician ∫

@inproceedings{e.1953der,
  title={Der aligemeine Integralkosinus Ci($z, α$)},
  author={E. Kreyszig},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203137101228774},
  booktitle={Acta Mathematica},
  volume={89},
  number={1},
  pages={107-131},
  year={1953},
}