1. Jain, A., Bolle, R., & Pankanti, S. (1999). Biometrics: personal identification in networked society. Berlin: Springer.
2. Schuckers, S. (2002). Spoofing and anti-spoofing measures, information security technical report (Vol. 7, pp. 56–62). Amsterdam: Elsevier.
3. Bigun, J., Fronthaler, H., & Kollreider, K. (2004). Assuring liveness in biometric identity authentication by real-time face tracking. In: IEEE international conference on computational intelligence for homeland security and personal safety (CIHSPS’04) (pp. 104–111), 21–22 July 2004.
4. Parthasaradhi, S., Derakhshani, R., Hornak, L., & Schuckers, S. (2005). Time-series detection of perspiration as a liveness test in fingerprint devices. IEEE Trans. Syst. Man Cybern., 35(3), 335–343.
5. Antonelli, A., Cappelli, R., Maio, D., & Maltoni, D. (2006). Fake finger detection by skin distortion analysis. IEEE Trans. Inf. Forensics Secur., 1(3), 360–373.