@inproceedings{ICDAR-1997-Nishida,
	author        = "Hirobumi Nishida",
	booktitle     = "{Proceedings of the Fourth International Conference on Document Analysis and Recognition}",
	doi           = "10.1109/ICDAR.1997.619828",
	isbn          = "0-8186-7898-4",
	pages         = "132--141",
	publisher     = "{IEEE Computer Society}",
	title         = "{Boundary Feature Extraction from Gray-Scale Document Images}",
	year          = 1997,
}