Akio Fujiyoshi Masakazu Suzuki Seiichi Uchida Syntactic Detection and Correction of Misrecognitions in Mathematical OCR. 1360-1364 2009 ICDAR http://dx.doi.org/10.1109/ICDAR.2009.150 conf/icdar/2009 db/conf/icdar/icdar2009.html#FujiyoshiSU09