Face Liveness Detection Competition (LivDet-Face) - 2021. - Sandip Purnapatra; Nic Smalt; Keivan Bahmani; Priyanka Das 004; David Yambay; Amir Mohammadi; Anjith George; Thirimachos Bourlai; Sébastien Marcel; Stephanie Schuckers; Meiling Fang; Naser Damer; et al. (IJCB, 2021)