@book{29079,
	author = {Reuter, Walter, ed.},
	title = {Nondestructive Evaluation of Utilities and Pipelines III},
	publisher = {SPIE},
	year = {1999},
	series = {Proceedings of SPIE; V. 3588},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/3588}
}