@book{23432,
	author = {Henkel, Paul, ed.},
	title = {Airborne Reconnaissance X},
	publisher = {SPIE},
	year = {1987},
	series = {Proceedings of SPIE; V. 0694},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/0694}
}