@inproceedings{CASE-2012-GuKJ,
	author        = "Lichen Gu and Xueqin Kou and Jia Jia",
	booktitle     = "{Proceedings of the Eighth International Conference on Automation Science and Engineering}",
	doi           = "10.1109/CoASE.2012.6386344",
	isbn          = "978-1-4673-0429-0",
	pages         = "1028--1032",
	publisher     = "{IEEE}",
	title         = "{Distance measurement for tower crane obstacle based on multi-ultrasonic sensors}",
	year          = 2012,
}