MathSciDoc: An Archive for Mathematician ∫

@inproceedings{j.1941the,
  title={The poweroid, an extension of the mathematical notion of power},
  author={J. F. Steffensen},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203117115123626},
  booktitle={Acta Mathematica},
  volume={73},
  number={1},
  pages={333-366},
  year={1941},
}