Yoshitake Tsuji Hiroyuki Kami Masaaki Mizuno Toshiyuki Tanaka Haruhiko Tanaka Masao Iwashita Tsutomu Temma Document Recognition System with Layout Structure Generator. 479-482 1990 MVA http://b2.cvl.iis.u-tokyo.ac.jp/mva/proceedings/CommemorativeDVD/1990/papers/1990479.pdf conf/mva/1990 db/conf/mva/mva1990.html#TsujiKMTTIT90