@article{ropadrobustpresentationattackdetection,
  title = {RoPAD: Robust Presentation Attack Detection through Unsupervised Adversarial Invariance},
  author = {Ayush Jaiswal and Shuai Xia and Iacopo Masi and Wael Abd-Almageed},
  year = {2019},
  eprint = {1903.03691},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1903.03691v2},
}