@book{32789,
	author = {Clark, Bill, ed.},
	title = {State-of-the-Art Mapping},
	publisher = {SPIE},
	year = {1993},
	series = {Proceedings of SPIE; V. 1943},
	address = {Washington, USA},
	url = {https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1943}
}