@book{23397,
	author = {Cindrich, Ivan, ed.},
	title = {Aerial Surveillance Sensing Including Obscured and Underground Object Detection},
	publisher = {SPIE},
	year = {1994},
	series = {Proceedings of SPIE; V. 2217},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/2217}
}