@inproceedings{ICDAR-1993-Hirayama,
	author        = "Yuki Hirayama",
	booktitle     = "{Proceedings of the Second International Conference on Document Analysis and Recognition}",
	doi           = "10.1109/ICDAR.1993.395775",
	isbn          = "0-8186-4960-7",
	pages         = "91--94",
	publisher     = "{IEEE}",
	title         = "{A block segmentation method for document images with complicated column structures}",
	year          = 1993,
}