Achint Oommen Thomas Nalini K. Ratha Jonathan H. Connell Ruud M. Bolle Comparative analysis of registration based and registration free methods for cancelable fingerprint biometrics. 1-4 2008 ICPR http://dx.doi.org/10.1109/ICPR.2008.4761461 conf/icpr/2008 db/conf/icpr/icpr2008.html#ThomasRCB08