Hatem Hamza Yolande Belaïd Abdel Belaïd Bidyut Baran Chaudhuri Incremental classification of invoice documents. 1-4 2008 ICPR http://dx.doi.org/10.1109/ICPR.2008.4761832 conf/icpr/2008 db/conf/icpr/icpr2008.html#HamzaBBC08