@article{flexiblemodalfaceantispoofingabenchmark,
  title = {Flexible-Modal Face Anti-Spoofing: A Benchmark},
  author = {Zitong Yu and Ajian Liu and Chenxu Zhao and Kevin H. M. Cheng and Xu Cheng and Guoying Zhao},
  year = {2022},
  eprint = {2202.08192},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2202.08192v3},
}