@article{facialbehavioranalysisusing4dcurvature,
  title = {Facial Behavior Analysis using 4D Curvature Statistics for Presentation Attack Detection},
  author = {Martin Thümmel and Sven Sickert and Joachim Denzler},
  year = {2019},
  eprint = {1910.06056},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1910.06056v4},
}