Hailong Liu Xiaoqing Ding Handwritten Character Recognition Using Gradient Feature and Quadratic Classifier with Multiple Discrimination Schemes. 19-25 2005 conf/icdar/2005 ICDAR http://doi.ieeecomputersociety.org/10.1109/ICDAR.2005.123 db/conf/icdar/icdar2005.html#LiuD05