@article{acar2019privacy,
  title={A privacy-preserving multifactor authentication system},
  author={Acar, Abbas and Liu, Wenyi and Bayeh, Raheem and Akkaya, Kemal and Uluagac, Arif Selcuk},
  journal={Security and Privacy},
  volume={2},
  number={5},
  pages={e88},
  year={2019},
  publisher={Wiley Periodicals, Inc.}
}