Giulia Piccioli Enrico De Micheli Marco Campani A robust method for road sign detection and recognition. 495-500 1994 conf/eccv/1994-1 ECCV (1) db/conf/eccv/eccv1994-1.html#PiccioliMC94 http://dx.doi.org/10.1007/3-540-57956-7_55