Cheng-Lin Liu Masashi Koga Hiromichi Fujisawa Gabor Feature Extraction for Character Recognition: Comparison with Gradient Feature. 121-125 2005 conf/icdar/2005 ICDAR http://doi.ieeecomputersociety.org/10.1109/ICDAR.2005.119 db/conf/icdar/icdar2005.html#LiuKF05