@book{23435,
	author = {Henkel, Paul, ed.},
	title = {Airborne Reconnaissance XIII},
	publisher = {SPIE},
	year = {1990},
	series = {Proceedings of SPIE; V. 1156},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1156}
}