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\bibitem{3661} Ajian Liu, Zichang Tan, Jun Wan, Sergio Escalera, Guodong Guo, \& Stan Z. Li. (2021). CASIA-SURF CeFA: A Benchmark for Multi-modal Cross-Ethnicity Face Anti-Spoofing. In \textit{IEEE Winter Conference on Applications of Computer Vision} (pp. 1178--1186).

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