Ajita Rattani Biagio Freni Gian Luca Marcialis Fabio Roli Template Update Methods in Adaptive Biometric Systems: A Critical Review. 847-856 2009 ICB http://dx.doi.org/10.1007/978-3-642-01793-3_86 conf/icb/2009 db/conf/icb/icb2009.html#RattaniFMR09