@inproceedings{ali2021ad,
  title={Ad Delivery Algorithms: The Hidden Arbiters of Political Messaging},
  author={Ali, Muhammad and Sapiezynski, Piotr and Korolova, Aleksandra and Mislove, Alan and Rieke, Aaron},
  booktitle={Proceedings of the 14th ACM International Conference on Web Search and Data Mining},
  pages={13--21},
  year={2021}
}