@article{gerring2019rules,
  title={Who rules the world? A portrait of the global leadership class},
  author={Gerring, John and Oncel, Erzen and Morrison, Kevin and Pemstein, Daniel},
  journal={Perspectives on politics},
  volume={17},
  number={4},
  pages={1079--1097},
  year={2019},
  publisher={Cambridge University Press}
}