@inproceedings{ICDAR-2013-NayefB,
	author        = "Nibal Nayef and Thomas M. Breuel",
	booktitle     = "{Proceedings of the 12th International Conference on Document Analysis and Recognition}",
	doi           = "10.1109/ICDAR.2013.158",
	isbn          = "978-0-7695-4999-6",
	pages         = "773--777",
	publisher     = "{IEEE Computer Society}",
	title         = "{Constructing a Hierarchical Structure from Symbol Alphabets of Technical Line Drawings}",
	year          = 2013,
}