[1] Bolle R, Connell J, Pankanti S, et al . Guide to biometrics, Springer , November 6, 2003
[2] Ashbourn J , Practical biometrics: From aspiration to implementation, Springer ; November 18, 2003
[3] Nanavati S, Thieme M, Nanavati R , Biometrics: Identity verification in a networked world, Wiley ; March 15, 2002 .
[4] International Biometric Group (IBG) , http://www.biometricgroup.com