Vincenzo Conti Davide Perconti Salvatore Romano G. Tona Salvatore Vitabile Salvatore Gaglio Filippo Sorbello Fast Fingerprints Classification Only Using the Directional Image. 34-41 2007 conf/kes/2007-1 KES (1) http://dx.doi.org/10.1007/978-3-540-74819-9_5 db/conf/kes/kes2007-1.html#ContiPRTVGS07