Mineichi Kudo Koji Mizukami Yuji Nakamura Masaru Shimbo Realization of membership quiries in character recognition. 77-82 1996 17 Pattern Recognition Letters 1 http://dx.doi.org/10.1016/0167-8655(95)00090-9 db/journals/prl/prl17.html#KudoMNS96