Hiroshi Sako Naohiro Furukawa Masakazu Fujio Shigeru Watanabe Document-Form Identification Using Constellation Matching of Keywords Abstracted by Character Recognition. 261-271 2002 conf/das/2002 Document Analysis Systems http://link.springer.de/link/service/series/0558/bibs/2423/24230261.htm db/conf/das/das2002.html#SakoFFW02