MathSciDoc: An Archive for Mathematician ∫

@inproceedings{george1958unitary,
  title={Unitary representations of group extensions. I},
  author={George W. Mackey},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203151185188878},
  booktitle={Acta Mathematica},
  volume={99},
  number={1},
  pages={265-311},
  year={1958},
}